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Can I use LPGL3 for library and Apache 2 for “main()”?


Can I link a Apache 2.0 library into software under GPLv2?Open source licensing with extra restriction clauseHow is the LGPL different from the GPL with a class path exception?Keeping contributions and allowing free use of libraries. i.e. Complex licencing issuePublishing Java project with LGPL licensed moduleDiscord bot and Apache LicenseLicense to use for smaller GitHub reposCan I use bits of source from another library in an original work without having to worry about license issues?Are there legal reasons blocking the use of Apache 2 License in FranceCan I use Apache 2.0 licensed libraries with AGPL licensed libraries?













4















My project is a command which is split in library modules (the logic) and a "main" module, which glues my lib modules to make the CLI command.



I don't really care about what people can write with the lib or the main module, but I want people to be forced to publish any modification they make to the lib, so I though I could double-license my project with LGPL3 + Apache2, the LPGL3 would be for lib modules. Would this be feasible? Would this result in what I described?










share|improve this question







New contributor



LivingSilver94 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • One obvious question: Is the main() really complicated enough to need a separate license? If it's "just" argv[] parsing plus function dispatch, then maybe it would be simpler to license it under the same license as the core lib. Anyone can just re-implement those things on their own anyway.

    – Kevin
    May 6 at 16:29











  • It's a collection of subcommands actually, but they're not complicated at all. I though to use a double license since the "L" in LGPL usually stands for "library"...

    – LivingSilver94
    May 6 at 17:07











  • Yeah, just license your program as Apache2. As long as you provide the source code of the LGPL library that you use (or just dynamically link to it), then you'll be fine.

    – Greg Schmit
    May 6 at 19:33











  • @GregSchmit no I don't use any LGPL library; it's my lib that I want to license.

    – LivingSilver94
    May 6 at 19:34











  • Oh, gotcha, that makes more sense. Then yeah you can absolutely license the library portion differently than the main file.

    – Greg Schmit
    May 6 at 19:35















4















My project is a command which is split in library modules (the logic) and a "main" module, which glues my lib modules to make the CLI command.



I don't really care about what people can write with the lib or the main module, but I want people to be forced to publish any modification they make to the lib, so I though I could double-license my project with LGPL3 + Apache2, the LPGL3 would be for lib modules. Would this be feasible? Would this result in what I described?










share|improve this question







New contributor



LivingSilver94 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • One obvious question: Is the main() really complicated enough to need a separate license? If it's "just" argv[] parsing plus function dispatch, then maybe it would be simpler to license it under the same license as the core lib. Anyone can just re-implement those things on their own anyway.

    – Kevin
    May 6 at 16:29











  • It's a collection of subcommands actually, but they're not complicated at all. I though to use a double license since the "L" in LGPL usually stands for "library"...

    – LivingSilver94
    May 6 at 17:07











  • Yeah, just license your program as Apache2. As long as you provide the source code of the LGPL library that you use (or just dynamically link to it), then you'll be fine.

    – Greg Schmit
    May 6 at 19:33











  • @GregSchmit no I don't use any LGPL library; it's my lib that I want to license.

    – LivingSilver94
    May 6 at 19:34











  • Oh, gotcha, that makes more sense. Then yeah you can absolutely license the library portion differently than the main file.

    – Greg Schmit
    May 6 at 19:35













4












4








4








My project is a command which is split in library modules (the logic) and a "main" module, which glues my lib modules to make the CLI command.



I don't really care about what people can write with the lib or the main module, but I want people to be forced to publish any modification they make to the lib, so I though I could double-license my project with LGPL3 + Apache2, the LPGL3 would be for lib modules. Would this be feasible? Would this result in what I described?










share|improve this question







New contributor



LivingSilver94 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











My project is a command which is split in library modules (the logic) and a "main" module, which glues my lib modules to make the CLI command.



I don't really care about what people can write with the lib or the main module, but I want people to be forced to publish any modification they make to the lib, so I though I could double-license my project with LGPL3 + Apache2, the LPGL3 would be for lib modules. Would this be feasible? Would this result in what I described?







license-recommendation apache-2.0 lgpl






share|improve this question







New contributor



LivingSilver94 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.










share|improve this question







New contributor



LivingSilver94 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








share|improve this question




share|improve this question






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asked May 6 at 14:35









LivingSilver94LivingSilver94

211




211




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New contributor




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Check out our Code of Conduct.














  • One obvious question: Is the main() really complicated enough to need a separate license? If it's "just" argv[] parsing plus function dispatch, then maybe it would be simpler to license it under the same license as the core lib. Anyone can just re-implement those things on their own anyway.

    – Kevin
    May 6 at 16:29











  • It's a collection of subcommands actually, but they're not complicated at all. I though to use a double license since the "L" in LGPL usually stands for "library"...

    – LivingSilver94
    May 6 at 17:07











  • Yeah, just license your program as Apache2. As long as you provide the source code of the LGPL library that you use (or just dynamically link to it), then you'll be fine.

    – Greg Schmit
    May 6 at 19:33











  • @GregSchmit no I don't use any LGPL library; it's my lib that I want to license.

    – LivingSilver94
    May 6 at 19:34











  • Oh, gotcha, that makes more sense. Then yeah you can absolutely license the library portion differently than the main file.

    – Greg Schmit
    May 6 at 19:35

















  • One obvious question: Is the main() really complicated enough to need a separate license? If it's "just" argv[] parsing plus function dispatch, then maybe it would be simpler to license it under the same license as the core lib. Anyone can just re-implement those things on their own anyway.

    – Kevin
    May 6 at 16:29











  • It's a collection of subcommands actually, but they're not complicated at all. I though to use a double license since the "L" in LGPL usually stands for "library"...

    – LivingSilver94
    May 6 at 17:07











  • Yeah, just license your program as Apache2. As long as you provide the source code of the LGPL library that you use (or just dynamically link to it), then you'll be fine.

    – Greg Schmit
    May 6 at 19:33











  • @GregSchmit no I don't use any LGPL library; it's my lib that I want to license.

    – LivingSilver94
    May 6 at 19:34











  • Oh, gotcha, that makes more sense. Then yeah you can absolutely license the library portion differently than the main file.

    – Greg Schmit
    May 6 at 19:35
















One obvious question: Is the main() really complicated enough to need a separate license? If it's "just" argv[] parsing plus function dispatch, then maybe it would be simpler to license it under the same license as the core lib. Anyone can just re-implement those things on their own anyway.

– Kevin
May 6 at 16:29





One obvious question: Is the main() really complicated enough to need a separate license? If it's "just" argv[] parsing plus function dispatch, then maybe it would be simpler to license it under the same license as the core lib. Anyone can just re-implement those things on their own anyway.

– Kevin
May 6 at 16:29













It's a collection of subcommands actually, but they're not complicated at all. I though to use a double license since the "L" in LGPL usually stands for "library"...

– LivingSilver94
May 6 at 17:07





It's a collection of subcommands actually, but they're not complicated at all. I though to use a double license since the "L" in LGPL usually stands for "library"...

– LivingSilver94
May 6 at 17:07













Yeah, just license your program as Apache2. As long as you provide the source code of the LGPL library that you use (or just dynamically link to it), then you'll be fine.

– Greg Schmit
May 6 at 19:33





Yeah, just license your program as Apache2. As long as you provide the source code of the LGPL library that you use (or just dynamically link to it), then you'll be fine.

– Greg Schmit
May 6 at 19:33













@GregSchmit no I don't use any LGPL library; it's my lib that I want to license.

– LivingSilver94
May 6 at 19:34





@GregSchmit no I don't use any LGPL library; it's my lib that I want to license.

– LivingSilver94
May 6 at 19:34













Oh, gotcha, that makes more sense. Then yeah you can absolutely license the library portion differently than the main file.

– Greg Schmit
May 6 at 19:35





Oh, gotcha, that makes more sense. Then yeah you can absolutely license the library portion differently than the main file.

– Greg Schmit
May 6 at 19:35










2 Answers
2






active

oldest

votes


















4














Sure, you can use such a construction. However, it would be much simpler if you license the command line wrapper under the LGPL as well.



The “L” in LGPL officially does not stand for “library” but “lesser” than the main GPL: it scopes its protections to the LGPL-covered component, and does not affect the entire program. For the FSF this is a matter of strategy: they want to increase the amount of free software in the world. The LGPL does not help as much as the GPL because it doesn't entice users of the component to publish their software under a free license as well.



The LGPLv3 is implemented as a section 7 exception to the GPLv3. If the conditions in that exception do not trigger (linking), then it behaves effectively identical to the GPLv3. It is therefore perfectly fine to use it for applications as well.






share|improve this answer























  • It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

    – Greg Schmit
    May 6 at 19:31











  • @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

    – amon
    May 6 at 19:40






  • 1





    Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

    – Greg Schmit
    May 6 at 19:42


















1














@amon is mostly right, however my understanding is that you want others to make changes to main and not have to publish those changes upon distribution of the binary. In that case, license your main file as Apache2 (or something else that's permissive like BSD/MIT) and the library as LGPL.



Normally projects have a LICENSE file in the repository, however you might want to leave that out and then at the top of the files actually put the license for that file. Or you could have a LICENSE that explains the licensing of the project.



You could also split the project into the library portion and the executable portion that links to the library, or you could choose to license it all under a single license.






share|improve this answer










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Greg Schmit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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    2 Answers
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    2 Answers
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    oldest

    votes






    active

    oldest

    votes









    4














    Sure, you can use such a construction. However, it would be much simpler if you license the command line wrapper under the LGPL as well.



    The “L” in LGPL officially does not stand for “library” but “lesser” than the main GPL: it scopes its protections to the LGPL-covered component, and does not affect the entire program. For the FSF this is a matter of strategy: they want to increase the amount of free software in the world. The LGPL does not help as much as the GPL because it doesn't entice users of the component to publish their software under a free license as well.



    The LGPLv3 is implemented as a section 7 exception to the GPLv3. If the conditions in that exception do not trigger (linking), then it behaves effectively identical to the GPLv3. It is therefore perfectly fine to use it for applications as well.






    share|improve this answer























    • It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

      – Greg Schmit
      May 6 at 19:31











    • @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

      – amon
      May 6 at 19:40






    • 1





      Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

      – Greg Schmit
      May 6 at 19:42















    4














    Sure, you can use such a construction. However, it would be much simpler if you license the command line wrapper under the LGPL as well.



    The “L” in LGPL officially does not stand for “library” but “lesser” than the main GPL: it scopes its protections to the LGPL-covered component, and does not affect the entire program. For the FSF this is a matter of strategy: they want to increase the amount of free software in the world. The LGPL does not help as much as the GPL because it doesn't entice users of the component to publish their software under a free license as well.



    The LGPLv3 is implemented as a section 7 exception to the GPLv3. If the conditions in that exception do not trigger (linking), then it behaves effectively identical to the GPLv3. It is therefore perfectly fine to use it for applications as well.






    share|improve this answer























    • It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

      – Greg Schmit
      May 6 at 19:31











    • @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

      – amon
      May 6 at 19:40






    • 1





      Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

      – Greg Schmit
      May 6 at 19:42













    4












    4








    4







    Sure, you can use such a construction. However, it would be much simpler if you license the command line wrapper under the LGPL as well.



    The “L” in LGPL officially does not stand for “library” but “lesser” than the main GPL: it scopes its protections to the LGPL-covered component, and does not affect the entire program. For the FSF this is a matter of strategy: they want to increase the amount of free software in the world. The LGPL does not help as much as the GPL because it doesn't entice users of the component to publish their software under a free license as well.



    The LGPLv3 is implemented as a section 7 exception to the GPLv3. If the conditions in that exception do not trigger (linking), then it behaves effectively identical to the GPLv3. It is therefore perfectly fine to use it for applications as well.






    share|improve this answer













    Sure, you can use such a construction. However, it would be much simpler if you license the command line wrapper under the LGPL as well.



    The “L” in LGPL officially does not stand for “library” but “lesser” than the main GPL: it scopes its protections to the LGPL-covered component, and does not affect the entire program. For the FSF this is a matter of strategy: they want to increase the amount of free software in the world. The LGPL does not help as much as the GPL because it doesn't entice users of the component to publish their software under a free license as well.



    The LGPLv3 is implemented as a section 7 exception to the GPLv3. If the conditions in that exception do not trigger (linking), then it behaves effectively identical to the GPLv3. It is therefore perfectly fine to use it for applications as well.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered May 6 at 17:28









    amonamon

    13.7k11536




    13.7k11536












    • It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

      – Greg Schmit
      May 6 at 19:31











    • @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

      – amon
      May 6 at 19:40






    • 1





      Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

      – Greg Schmit
      May 6 at 19:42

















    • It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

      – Greg Schmit
      May 6 at 19:31











    • @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

      – amon
      May 6 at 19:40






    • 1





      Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

      – Greg Schmit
      May 6 at 19:42
















    It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

    – Greg Schmit
    May 6 at 19:31





    It seems that the OP's intent is that modifications to main shouldn't be required to be published. My understanding was that if you use the LGPL license then others can link to it but if they make changes to it then they must release those changes. Advising the OP to use the LGPL violates the OP's intent to avoid that requirement.

    – Greg Schmit
    May 6 at 19:31













    @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

    – amon
    May 6 at 19:40





    @GregSchmit No open source license (that I am aware of) requires changes to be published. GPL/LGPL only require that the corresponding source be provided alongside any binaries that are conveyed/distributed. It seems the main() will be fairly banal code, and it's probably not worth avoiding a copyleft license there if most code in the application is already under the LGPL.

    – amon
    May 6 at 19:40




    1




    1





    Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

    – Greg Schmit
    May 6 at 19:42





    Sorry, that's what I meant, his intent was others being allowed to change the main and distribute the binary without source and suggesting copyleft violates that intent. But I agree that avoiding copyleft on that might not be worth it.

    – Greg Schmit
    May 6 at 19:42











    1














    @amon is mostly right, however my understanding is that you want others to make changes to main and not have to publish those changes upon distribution of the binary. In that case, license your main file as Apache2 (or something else that's permissive like BSD/MIT) and the library as LGPL.



    Normally projects have a LICENSE file in the repository, however you might want to leave that out and then at the top of the files actually put the license for that file. Or you could have a LICENSE that explains the licensing of the project.



    You could also split the project into the library portion and the executable portion that links to the library, or you could choose to license it all under a single license.






    share|improve this answer










    New contributor



    Greg Schmit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      1














      @amon is mostly right, however my understanding is that you want others to make changes to main and not have to publish those changes upon distribution of the binary. In that case, license your main file as Apache2 (or something else that's permissive like BSD/MIT) and the library as LGPL.



      Normally projects have a LICENSE file in the repository, however you might want to leave that out and then at the top of the files actually put the license for that file. Or you could have a LICENSE that explains the licensing of the project.



      You could also split the project into the library portion and the executable portion that links to the library, or you could choose to license it all under a single license.






      share|improve this answer










      New contributor



      Greg Schmit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





















        1












        1








        1







        @amon is mostly right, however my understanding is that you want others to make changes to main and not have to publish those changes upon distribution of the binary. In that case, license your main file as Apache2 (or something else that's permissive like BSD/MIT) and the library as LGPL.



        Normally projects have a LICENSE file in the repository, however you might want to leave that out and then at the top of the files actually put the license for that file. Or you could have a LICENSE that explains the licensing of the project.



        You could also split the project into the library portion and the executable portion that links to the library, or you could choose to license it all under a single license.






        share|improve this answer










        New contributor



        Greg Schmit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.









        @amon is mostly right, however my understanding is that you want others to make changes to main and not have to publish those changes upon distribution of the binary. In that case, license your main file as Apache2 (or something else that's permissive like BSD/MIT) and the library as LGPL.



        Normally projects have a LICENSE file in the repository, however you might want to leave that out and then at the top of the files actually put the license for that file. Or you could have a LICENSE that explains the licensing of the project.



        You could also split the project into the library portion and the executable portion that links to the library, or you could choose to license it all under a single license.







        share|improve this answer










        New contributor



        Greg Schmit is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.








        share|improve this answer



        share|improve this answer








        edited May 6 at 19:45





















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        answered May 6 at 19:39









        Greg SchmitGreg Schmit

        1114




        1114




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