Natural Language Processing. Techopedia Terms. Connect with us. Sign up. Term of the Day. 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 simplest way to make a program free is to put it in the public domain , uncopyrighted. This allows people to share the program and their improvements, if they are so minded.
But it also allows uncooperative people to convert the program into proprietary software. They can make changes, many or few, and distribute the result as a proprietary product. People who receive the program in that modified form do not have the freedom that the original author gave them; the middleman has stripped it away. If middlemen could strip off the freedom, we might have many users, but those users would not have freedom. Copyleft says that anyone who redistributes the software, with or without changes, must pass along the freedom to further copy and change it.
Copyleft guarantees that every user has freedom. Copyleft also provides an incentive for other programmers to add to free software. Copyleft also helps programmers who want to contribute improvements to free software get permission to do that. 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. 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.
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.
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.
The third difference between the two versions is that the GPLv3 was written in an attempt to increase usage worldwide. The language used in GPLv3 to describe the license rights was modified to ensure that international laws will interpret it as the FSF intended, unlike the language used in GPLv2, which is considered very US centric.
GPLv3 also allows developers to add local disclaimers, which also helps increasing its usage outside the US. The new language used in the GPLv3 establishes this even more clearly. There is, however, an issue with the original BSD license as it imposes a specific requirement that is not in the GPL the requirement on advertisements of the program.
LGPL is used to license free software so that it can be incorporated into both free and proprietary software. You are only obliged to subject your modifications to the original free library to the LGPL. Since the free library is always subject to the LGPL, it must be possible for any user of your software to modify, recompile or replace the free LGPL library and use its modified version with your software.
You are also required to permit or note prevent reverse engineering of the work that uses the library in order to enable debugging when the LGPL library is modified replaced with later versions. If a developer modifies a program released under the GPL, he is expected to release the modified program under the same license, but if this program runs on a server only, the developer is not really releasing it to the rest of the world.
The AGPL covers this case.
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