This is wget.info, produced by makeinfo version 4.3 from ./wget.texi. INFO-DIR-SECTION Network Applications START-INFO-DIR-ENTRY * Wget: (wget). The non-interactive network downloader. END-INFO-DIR-ENTRY This file documents the the GNU Wget utility for downloading network data. Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with the Invariant Sections being "GNU General Public License" and "GNU Free Documentation License", with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".  File: wget.info, Node: Advanced Usage, Next: Very Advanced Usage, Prev: Simple Usage, Up: Examples Advanced Usage ============== * You have a file that contains the URLs you want to download? Use the `-i' switch: wget -i FILE If you specify `-' as file name, the URLs will be read from standard input. * Create a five levels deep mirror image of the GNU web site, with the same directory structure the original has, with only one try per document, saving the log of the activities to `gnulog': wget -r http://www.gnu.org/ -o gnulog * The same as the above, but convert the links in the HTML files to point to local files, so you can view the documents off-line: wget --convert-links -r http://www.gnu.org/ -o gnulog * Retrieve only one HTML page, but make sure that all the elements needed for the page to be displayed, such as inline images and external style sheets, are also downloaded. Also make sure the downloaded page references the downloaded links. wget -p --convert-links http://www.server.com/dir/page.html The HTML page will be saved to `www.server.com/dir/page.html', and the images, stylesheets, etc., somewhere under `www.server.com/', depending on where they were on the remote server. * The same as the above, but without the `www.server.com/' directory. In fact, I don't want to have all those random server directories anyway--just save _all_ those files under a `download/' subdirectory of the current directory. wget -p --convert-links -nH -nd -Pdownload \ http://www.server.com/dir/page.html * Retrieve the index.html of `www.lycos.com', showing the original server headers: wget -S http://www.lycos.com/ * Save the server headers with the file, perhaps for post-processing. wget -s http://www.lycos.com/ more index.html * Retrieve the first two levels of `wuarchive.wustl.edu', saving them to `/tmp'. wget -r -l2 -P/tmp ftp://wuarchive.wustl.edu/ * You want to download all the GIFs from a directory on an HTTP server. You tried `wget http://www.server.com/dir/*.gif', but that didn't work because HTTP retrieval does not support globbing. In that case, use: wget -r -l1 --no-parent -A.gif http://www.server.com/dir/ More verbose, but the effect is the same. `-r -l1' means to retrieve recursively (*note Recursive Retrieval::), with maximum depth of 1. `--no-parent' means that references to the parent directory are ignored (*note Directory-Based Limits::), and `-A.gif' means to download only the GIF files. `-A "*.gif"' would have worked too. * Suppose you were in the middle of downloading, when Wget was interrupted. Now you do not want to clobber the files already present. It would be: wget -nc -r http://www.gnu.org/ * If you want to encode your own username and password to HTTP or FTP, use the appropriate URL syntax (*note URL Format::). wget ftp://hniksic:mypassword@unix.server.com/.emacs Note, however, that this usage is not advisable on multi-user systems because it reveals your password to anyone who looks at the output of `ps'. * You would like the output documents to go to standard output instead of to files? wget -O - http://jagor.srce.hr/ http://www.srce.hr/ You can also combine the two options and make pipelines to retrieve the documents from remote hotlists: wget -O - http://cool.list.com/ | wget --force-html -i -  File: wget.info, Node: Very Advanced Usage, Prev: Advanced Usage, Up: Examples Very Advanced Usage =================== * If you wish Wget to keep a mirror of a page (or FTP subdirectories), use `--mirror' (`-m'), which is the shorthand for `-r -l inf -N'. You can put Wget in the crontab file asking it to recheck a site each Sunday: crontab 0 0 * * 0 wget --mirror http://www.gnu.org/ -o /home/me/weeklog * In addition to the above, you want the links to be converted for local viewing. But, after having read this manual, you know that link conversion doesn't play well with timestamping, so you also want Wget to back up the original HTML files before the conversion. Wget invocation would look like this: wget --mirror --convert-links --backup-converted \ http://www.gnu.org/ -o /home/me/weeklog * But you've also noticed that local viewing doesn't work all that well when HTML files are saved under extensions other than `.html', perhaps because they were served as `index.cgi'. So you'd like Wget to rename all the files served with content-type `text/html' or `application/xhtml+xml' to `NAME.html'. wget --mirror --convert-links --backup-converted \ --html-extension -o /home/me/weeklog \ http://www.gnu.org/ Or, with less typing: wget -m -k -K -E http://www.gnu.org/ -o /home/me/weeklog  File: wget.info, Node: Various, Next: Appendices, Prev: Examples, Up: Top Various ******* This chapter contains all the stuff that could not fit anywhere else. * Menu: * Proxies:: Support for proxy servers * Distribution:: Getting the latest version. * Mailing List:: Wget mailing list for announcements and discussion. * Reporting Bugs:: How and where to report bugs. * Portability:: The systems Wget works on. * Signals:: Signal-handling performed by Wget.  File: wget.info, Node: Proxies, Next: Distribution, Prev: Various, Up: Various Proxies ======= "Proxies" are special-purpose HTTP servers designed to transfer data from remote servers to local clients. One typical use of proxies is lightening network load for users behind a slow connection. This is achieved by channeling all HTTP and FTP requests through the proxy which caches the transferred data. When a cached resource is requested again, proxy will return the data from cache. Another use for proxies is for companies that separate (for security reasons) their internal networks from the rest of Internet. In order to obtain information from the Web, their users connect and retrieve remote data using an authorized proxy. Wget supports proxies for both HTTP and FTP retrievals. The standard way to specify proxy location, which Wget recognizes, is using the following environment variables: `http_proxy' This variable should contain the URL of the proxy for HTTP connections. `ftp_proxy' This variable should contain the URL of the proxy for FTP connections. It is quite common that HTTP_PROXY and FTP_PROXY are set to the same URL. `no_proxy' This variable should contain a comma-separated list of domain extensions proxy should _not_ be used for. For instance, if the value of `no_proxy' is `.mit.edu', proxy will not be used to retrieve documents from MIT. In addition to the environment variables, proxy location and settings may be specified from within Wget itself. `-Y on/off' `--proxy=on/off' `proxy = on/off' This option may be used to turn the proxy support on or off. Proxy support is on by default, provided that the appropriate environment variables are set. `http_proxy = URL' `ftp_proxy = URL' `no_proxy = STRING' These startup file variables allow you to override the proxy settings specified by the environment. Some proxy servers require authorization to enable you to use them. The authorization consists of "username" and "password", which must be sent by Wget. As with HTTP authorization, several authentication schemes exist. For proxy authorization only the `Basic' authentication scheme is currently implemented. You may specify your username and password either through the proxy URL or through the command-line options. Assuming that the company's proxy is located at `proxy.company.com' at port 8001, a proxy URL location containing authorization data might look like this: http://hniksic:mypassword@proxy.company.com:8001/ Alternatively, you may use the `proxy-user' and `proxy-password' options, and the equivalent `.wgetrc' settings `proxy_user' and `proxy_passwd' to set the proxy username and password.  File: wget.info, Node: Distribution, Next: Mailing List, Prev: Proxies, Up: Various Distribution ============ Like all GNU utilities, the latest version of Wget can be found at the master GNU archive site ftp.gnu.org, and its mirrors. For example, Wget 1.9.1 can be found at  File: wget.info, Node: Mailing List, Next: Reporting Bugs, Prev: Distribution, Up: Various Mailing List ============ Wget has its own mailing list at , thanks to Karsten Thygesen. The mailing list is for discussion of Wget features and web, reporting Wget bugs (those that you think may be of interest to the public) and mailing announcements. You are welcome to subscribe. The more people on the list, the better! To subscribe, simply send mail to . Unsubscribe by mailing to . The mailing list is archived at . Alternative archive is available at .  File: wget.info, Node: Reporting Bugs, Next: Portability, Prev: Mailing List, Up: Various Reporting Bugs ============== You are welcome to send bug reports about GNU Wget to . Before actually submitting a bug report, please try to follow a few simple guidelines. 1. Please try to ascertain that the behavior you see really is a bug. If Wget crashes, it's a bug. If Wget does not behave as documented, it's a bug. If things work strange, but you are not sure about the way they are supposed to work, it might well be a bug. 2. Try to repeat the bug in as simple circumstances as possible. E.g. if Wget crashes while downloading `wget -rl0 -kKE -t5 -Y0 http://yoyodyne.com -o /tmp/log', you should try to see if the crash is repeatable, and if will occur with a simpler set of options. You might even try to start the download at the page where the crash occurred to see if that page somehow triggered the crash. Also, while I will probably be interested to know the contents of your `.wgetrc' file, just dumping it into the debug message is probably a bad idea. Instead, you should first try to see if the bug repeats with `.wgetrc' moved out of the way. Only if it turns out that `.wgetrc' settings affect the bug, mail me the relevant parts of the file. 3. Please start Wget with `-d' option and send the log (or the relevant parts of it). If Wget was compiled without debug support, recompile it. It is _much_ easier to trace bugs with debug support on. 4. If Wget has crashed, try to run it in a debugger, e.g. `gdb `which wget` core' and type `where' to get the backtrace.  File: wget.info, Node: Portability, Next: Signals, Prev: Reporting Bugs, Up: Various Portability =========== Since Wget uses GNU Autoconf for building and configuring, and avoids using "special" ultra-mega-cool features of any particular Unix, it should compile (and work) on all common Unix flavors. Various Wget versions have been compiled and tested under many kinds of Unix systems, including Solaris, Linux, SunOS, OSF (aka Digital Unix), Ultrix, *BSD, IRIX, and others; refer to the file `MACHINES' in the distribution directory for a comprehensive list. If you compile it on an architecture not listed there, please let me know so I can update it. Wget should also compile on the other Unix systems, not listed in `MACHINES'. If it doesn't, please let me know. Thanks to kind contributors, this version of Wget compiles and works on Microsoft Windows 95 and Windows NT platforms. It has been compiled successfully using MS Visual C++ 4.0, Watcom, and Borland C compilers, with Winsock as networking software. Naturally, it is crippled of some features available on Unix, but it should work as a substitute for people stuck with Windows. Note that the Windows port is *neither tested nor maintained* by me--all questions and problems should be reported to Wget mailing list at where the maintainers will look at them.  File: wget.info, Node: Signals, Prev: Portability, Up: Various Signals ======= Since the purpose of Wget is background work, it catches the hangup signal (`SIGHUP') and ignores it. If the output was on standard output, it will be redirected to a file named `wget-log'. Otherwise, `SIGHUP' is ignored. This is convenient when you wish to redirect the output of Wget after having started it. $ wget http://www.ifi.uio.no/~larsi/gnus.tar.gz & $ kill -HUP %% # Redirect the output to wget-log Other than that, Wget will not try to interfere with signals in any way. `C-c', `kill -TERM' and `kill -KILL' should kill it alike.  File: wget.info, Node: Appendices, Next: Copying, Prev: Various, Up: Top Appendices ********** This chapter contains some references I consider useful. * Menu: * Robot Exclusion:: Wget's support for RES. * Security Considerations:: Security with Wget. * Contributors:: People who helped.  File: wget.info, Node: Robot Exclusion, Next: Security Considerations, Prev: Appendices, Up: Appendices Robot Exclusion =============== It is extremely easy to make Wget wander aimlessly around a web site, sucking all the available data in progress. `wget -r SITE', and you're set. Great? Not for the server admin. As long as Wget is only retrieving static pages, and doing it at a reasonable rate (see the `--wait' option), there's not much of a problem. The trouble is that Wget can't tell the difference between the smallest static page and the most demanding CGI. A site I know has a section handled by a CGI Perl script that converts Info files to HTML on the fly. The script is slow, but works well enough for human users viewing an occasional Info file. However, when someone's recursive Wget download stumbles upon the index page that links to all the Info files through the script, the system is brought to its knees without providing anything useful to the user (This task of converting Info files could be done locally and access to Info documentation for all installed GNU software on a system is available from the `info' command). To avoid this kind of accident, as well as to preserve privacy for documents that need to be protected from well-behaved robots, the concept of "robot exclusion" was invented. The idea is that the server administrators and document authors can specify which portions of the site they wish to protect from robots and those they will permit access. The most popular mechanism, and the de facto standard supported by all the major robots, is the "Robots Exclusion Standard" (RES) written by Martijn Koster et al. in 1994. It specifies the format of a text file containing directives that instruct the robots which URL paths to avoid. To be found by the robots, the specifications must be placed in `/robots.txt' in the server root, which the robots are expected to download and parse. Although Wget is not a web robot in the strictest sense of the word, it can downloads large parts of the site without the user's intervention to download an individual page. Because of that, Wget honors RES when downloading recursively. For instance, when you issue: wget -r http://www.server.com/ First the index of `www.server.com' will be downloaded. If Wget finds that it wants to download more documents from that server, it will request `http://www.server.com/robots.txt' and, if found, use it for further downloads. `robots.txt' is loaded only once per each server. Until version 1.8, Wget supported the first version of the standard, written by Martijn Koster in 1994 and available at . As of version 1.8, Wget has supported the additional directives specified in the internet draft `' titled "A Method for Web Robots Control". The draft, which has as far as I know never made to an RFC, is available at . This manual no longer includes the text of the Robot Exclusion Standard. The second, less known mechanism, enables the author of an individual document to specify whether they want the links from the file to be followed by a robot. This is achieved using the `META' tag, like this: This is explained in some detail at . Wget supports this method of robot exclusion in addition to the usual `/robots.txt' exclusion. If you know what you are doing and really really wish to turn off the robot exclusion, set the `robots' variable to `off' in your `.wgetrc'. You can achieve the same effect from the command line using the `-e' switch, e.g. `wget -e robots=off URL...'.  File: wget.info, Node: Security Considerations, Next: Contributors, Prev: Robot Exclusion, Up: Appendices Security Considerations ======================= When using Wget, you must be aware that it sends unencrypted passwords through the network, which may present a security problem. Here are the main issues, and some solutions. 1. The passwords on the command line are visible using `ps'. The best way around it is to use `wget -i -' and feed the URLs to Wget's standard input, each on a separate line, terminated by `C-d'. Another workaround is to use `.netrc' to store passwords; however, storing unencrypted passwords is also considered a security risk. 2. Using the insecure "basic" authentication scheme, unencrypted passwords are transmitted through the network routers and gateways. 3. The FTP passwords are also in no way encrypted. There is no good solution for this at the moment. 4. Although the "normal" output of Wget tries to hide the passwords, debugging logs show them, in all forms. This problem is avoided by being careful when you send debug logs (yes, even when you send them to me).  File: wget.info, Node: Contributors, Prev: Security Considerations, Up: Appendices Contributors ============ GNU Wget was written by Hrvoje Niksic . However, its development could never have gone as far as it has, were it not for the help of many people, either with bug reports, feature proposals, patches, or letters saying "Thanks!". Special thanks goes to the following people (no particular order): * Karsten Thygesen--donated system resources such as the mailing list, web space, and FTP space, along with a lot of time to make these actually work. * Shawn McHorse--bug reports and patches. * Kaveh R. Ghazi--on-the-fly `ansi2knr'-ization. Lots of portability fixes. * Gordon Matzigkeit--`.netrc' support. * Zlatko Calusic, Tomislav Vujec and Drazen Kacar--feature suggestions and "philosophical" discussions. * Darko Budor--initial port to Windows. * Antonio Rosella--help and suggestions, plus the Italian translation. * Tomislav Petrovic, Mario Mikocevic--many bug reports and suggestions. * Francois Pinard--many thorough bug reports and discussions. * Karl Eichwalder--lots of help with internationalization and other things. * Junio Hamano--donated support for Opie and HTTP `Digest' authentication. * The people who provided donations for development, including Brian Gough. The following people have provided patches, bug/build reports, useful suggestions, beta testing services, fan mail and all the other things that make maintenance so much fun: Ian Abbott Tim Adam, Adrian Aichner, Martin Baehr, Dieter Baron, Roger Beeman, Dan Berger, T. Bharath, Paul Bludov, Daniel Bodea, Mark Boyns, John Burden, Wanderlei Cavassin, Gilles Cedoc, Tim Charron, Noel Cragg, Kristijan Conkas, John Daily, Ahmon Dancy, Andrew Davison, Andrew Deryabin, Ulrich Drepper, Marc Duponcheel, Damir Dzeko, Alan Eldridge, Aleksandar Erkalovic, Andy Eskilsson, Christian Fraenkel, Masashi Fujita, Howard Gayle, Marcel Gerrits, Lemble Gregory, Hans Grobler, Mathieu Guillaume, Dan Harkless, Aaron Hawley, Herold Heiko, Jochen Hein, Karl Heuer, HIROSE Masaaki, Gregor Hoffleit, Erik Magnus Hulthen, Richard Huveneers, Jonas Jensen, Simon Josefsson, Mario Juric, Hack Kampbjorn, Const Kaplinsky, Goran Kezunovic, Robert Kleine, KOJIMA Haime, Fila Kolodny, Alexander Kourakos, Martin Kraemer, Simos KSenitellis, Hrvoje Lacko, Daniel S. Lewart, Nicolas Lichtmeier, Dave Love, Alexander V. Lukyanov, Thomas Lussnig, Aurelien Marchand, Jordan Mendelson, Lin Zhe Min, Tim Mooney, Simon Munton, Charlie Negyesi, R. K. Owen, Andrew Pollock, Steve Pothier, Jan Prikryl, Marin Purgar, Csaba Raduly, Keith Refson, Bill Richardson, Tyler Riddle, Tobias Ringstrom, Juan Jose Rodrigues, Maciej W. Rozycki, Edward J. Sabol, Heinz Salzmann, Robert Schmidt, Andreas Schwab, Chris Seawood, Toomas Soome, Tage Stabell-Kulo, Sven Sternberger, Markus Strasser, John Summerfield, Szakacsits Szabolcs, Mike Thomas, Philipp Thomas, Mauro Tortonesi, Dave Turner, Gisle Vanem, Russell Vincent, Charles G Waldman, Douglas E. Wegscheid, Jasmin Zainul, Bojan Zdrnja, Kristijan Zimmer. Apologies to all who I accidentally left out, and many thanks to all the subscribers of the Wget mailing list.  File: wget.info, Node: Copying, Next: Concept Index, Prev: Appendices, Up: Top Copying ******* GNU Wget is licensed under the GNU GPL, which makes it "free software". Please note that "free" in "free software" refers to liberty, not price. As some GNU project advocates like to point out, think of "free speech" rather than "free beer". The exact and legally binding distribution terms are spelled out below; in short, you have the right (freedom) to run and change Wget and distribute it to other people, and even--if you want--charge money for doing either. The important restriction is that you have to grant your recipients the same rights and impose the same restrictions. This method of licensing software is also known as "open source" because, among other things, it makes sure that all recipients will receive the source code along with the program, and be able to improve it. The GNU project prefers the term "free software" for reasons outlined at . The exact license terms are defined by this paragraph and the GNU General Public License it refers to: GNU Wget is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. GNU Wget is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. A copy of the GNU General Public License is included as part of this manual; if you did not receive it, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. In addition to this, this manual is free in the same sense: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with the Invariant Sections being "GNU General Public License" and "GNU Free Documentation License", with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License". The full texts of the GNU General Public License and of the GNU Free Documentation License are available below. * Menu: * GNU General Public License:: * GNU Free Documentation License::  File: wget.info, Node: GNU General Public License, Next: GNU Free Documentation License, Prev: Copying, Up: Copying GNU General Public License ========================== Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass Ave, Cambridge, MA 02139, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble ======== The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 1. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 2. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 3. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a. You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b. You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c. If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 4. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a. Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b. Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c. Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 5. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 6. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 7. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 8. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 9. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 10. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 11. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 12. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 13. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs ============================================= If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. ONE LINE TO GIVE THE PROGRAM'S NAME AND AN IDEA OF WHAT IT DOES. Copyright (C) 19YY NAME OF AUTHOR This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. SIGNATURE OF TY COON, 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License.