BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Library GPL          BorlandTalk.com Forum Index -> C++ Builder (Non-Technical) View previous topic :: View next topic   Author Message Jonathan Benedicto Guest Posted: Tue Nov 15, 2005 4:23 pm    Post subject: Library GPL I was reading through the Library GPL, as one of my classes is using a Library GPL'ed library, and I just wanted someone to help clarify what the Library GPL requires from me to be able to use it in commercial programs. Eg, do I have to release my code. Jonathan Back to top Duane Hebert Guest Posted: Tue Nov 15, 2005 7:21 pm    Post subject: Re: Library GPL "Jonathan Benedicto" <incorrect (AT) no (DOT) server> wrote Quote: I was reading through the Library GPL, as one of my classes is using a Library GPL'ed library, and I just wanted someone to help clarify what the Library GPL requires from me to be able to use it in commercial programs. Eg, do I have to release my code. There are some different levels of GPL. There's LGPL for example that allows you to get away with a bit. Typically, GPL requires making your code available but again, it depends. Best to read the specific one or post here the section that you don't understand. Back to top Jonathan Benedicto Guest Posted: Tue Nov 15, 2005 7:33 pm    Post subject: Re: Library GPL Duane Hebert wrote: Quote: There are some different levels of GPL. There's LGPL for example that allows you to get away with a bit. Typically, GPL requires making your code available but again, it depends. Best to read the specific one or post here the section that you don't understand. Thank you, well here is the section. I wish that licences were written in a little more friendly form. <g> 5. A program that contains no derivative of any portion of the Library, but is designed to work with the Library by being compiled or linked with it, is called a "work that uses the Library". Such a work, in isolation, is not a derivative work of the Library, and therefore falls outside the scope of this License. However, linking a "work that uses the Library" with the Library creates an executable that is a derivative of the Library (because it contains portions of the Library), rather than a "work that uses the library". The executable is therefore covered by this License. Section 6 states terms for distribution of such executables. When a "work that uses the Library" uses material from a header file that is part of the Library, the object code for the work may be a derivative work of the Library even though the source code is not. Whether this is true is especially significant if the work can be linked without the Library, or if the work is itself a library. The threshold for this to be true is not precisely defined by law. If such an object file uses only numerical parameters, data structure layouts and accessors, and small macros and small inline functions (ten lines or less in length), then the use of the object file is unrestricted, regardless of whether it is legally a derivative work. (Executables containing this object code plus portions of the Library will still fall under Section 6.) Otherwise, if the work is a derivative of the Library, you may distribute the object code for the work under the terms of Section 6. Any executables containing that work also fall under Section 6, whether or not they are linked directly with the Library itself.  6. As an exception to the Sections above, you may also compile or link a "work that uses the Library" with the Library to produce a work containing portions of the Library, and distribute that work under terms of your choice, provided that the terms permit modification of the work for the customer's own use and reverse engineering for debugging such modifications. .... This seems to indicate that I can't use a Library GPL'ed library, even when dynamically linked without providing either the objs or the .cpp's. Jonathan Back to top Duane Hebert Guest Posted: Tue Nov 15, 2005 9:52 pm    Post subject: Re: Library GPL "Jonathan Benedicto" <incorrect (AT) no (DOT) server> wrote Quote: This seems to indicate that I can't use a Library GPL'ed library, even when dynamically linked without providing either the objs or the .cpp's. It sounds like that's the case. It sounds like you can write a library that can be linked with their library by another application without dealing with the license but if you have any compiled code that does use it, then you're bound by the license. I'm not a lawyer though. One thing that sometimes works is to contact the owner of the license with a specific question. Back to top Jonathan Benedicto Guest Posted: Tue Nov 15, 2005 9:58 pm    Post subject: Re: Library GPL Duane Hebert wrote: Quote: One thing that sometimes works is to contact the owner of the license with a specific question. Thank you, I'll do this. Jonathan Back to top Micha Nelissen Guest Posted: Wed Nov 16, 2005 9:01 pm    Post subject: Re: Library GPL On Tue, 15 Nov 2005 14:33:07 -0500 "Jonathan Benedicto" <incorrect (AT) no (DOT) server> wrote: Quote: This seems to indicate that I can't use a Library GPL'ed library, even when dynamically linked without providing either the objs or the .cpp's. The idea is basically that either: 1) you link dynamically to .dll, and you only provide the sources of the library (if asked for), but not for your application 2) you link the library statically into your app, then you need to provide the .obj's of your application with a linker script to be able to regenerate the executable with a new (possibly) patched version of the library. HTH, Micha Back to top Jonathan Benedicto Guest Posted: Wed Nov 16, 2005 10:35 pm    Post subject: Re: Library GPL Micha Nelissen wrote: Quote: The idea is basically that either: 1) you link dynamically to .dll, and you only provide the sources of the library (if asked for), but not for your application 2) you link the library statically into your app, then you need to provide the .obj's of your application with a linker script to be able to regenerate the executable with a new (possibly) patched version of the library. Ok, thank you. That makes sense. I wish that these licences were not so complicated. 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