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. 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.
This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. In such case, this License incorporates the limitation as if written in the body of this License. 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. 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.
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.
If the program is interactive, make it output a short notice like this when it starts in an interactive mode:. Not every version of every license is available in every format. If you need one that is missing, please email us. Legally speaking, the original English version of the licenses is what specifies the actual distribution terms for GNU programs and others that use them.
But to help people better understand the licenses, we give others permission to publish unofficial translations into other languages, provided that they follow our regulations for unofficial translations. The FSF does not approve license translations as officially valid.
The reason is that checking them would be difficult and expensive needing the help of bilingual lawyers in other countries. Even worse, if an error did slip through, the results could be disastrous for the whole free software community. As long as the translations are unofficial, they can't do any legal harm. To underscore the fact that these translations are not officially valid, we do not publish translations.
To make that clear, we don't post them on gnu. It used to be and for a few pages still is :. Verbatim copying and distribution of this entire article are permitted worldwide, without royalty, in any medium, provided this notice is preserved. Retention of weblinks in both hyperlinked and non-hyperlinked media as notes or some other form of printed URL in non-HTML media is required.
The proliferation of different free software licenses means increased work for users in understanding the licenses; we may be able to help you find an existing Free Software license that meets your needs. If that isn't possible, if you really need a new license, with our help you can ensure that the license really is a Free Software license and avoid various practical problems. Copyleft is a general method for making a program free software and requiring all modified and extended versions of the program to be free software as well.
The AGPL covers this case. Under the AGPL, the developer must release the modified version of the program to everyone who uses the service. So, these are ten of your top GPL License questions answered. Do you have any more? I would be happy to find the answers for you. The author of this blog is not a lawyer and you should not interpret this as legal advice of any kind. Information is provided on an as-is basis. For a legal consultation, please contact your legal advisor.
Rami Sass. The complete guide to Open Source Licenses Contents hide. 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.
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:. 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.
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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. 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. 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. 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.
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