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Say there is a commercial product that I have licensed, I have written my own plugin that integrates with a GPL licensed program. The program works fine and since it's personal use, I have not violated any licenses.

Now say, I just want to give the plugin away so that anyone else can use it:

  • I don't want any money for it.
  • I don't care if its binary and/or source code (someone else can compile it if necessary).
  • I don't care what license is applied to the code.

If I am reading this question/answer correctly: How can GPL terms apply to distribution of a proprietary plugin? Even an uncompiled source file would be considered a derived work.

So there is literally no way to even give the source code to someone else without violating the GPL? (since I don't have the source to the commercial program).

This does raise an interesting question of when does it become a derived work? for example is the idea of integrating product X&Y a derived work? How about a flow chart which outlines the high level design of the integration?

If I edit the code to remove all calls to the commercial application and in their place leave a natural language comment // TODO: Call feature X

The code now no longer has a dependency on the commercial application so can I distribute it under the GPL now?

Would just commenting out the calls to the commercial app be sufficient ?

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  • Please explain more about the interfaced between the different parts. Is there a defined interface (e.g. REST, CLI) by which the parts communicate, or will the parts be compiled together (unusual for a plug-in)? There are ways to create combinations by separating things sufficiently, so that they are not considered a 'derivative work'. May 12 at 8:48
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    For the sake of this argument lets say both the GPL and commercial apps are written in C and one of them is a library that is loaded into the process space of the other one.
    – DavidT
    May 12 at 11:03
  • The programming languages of the parts are irrelevant for the assessment. The interface(s) between the parts are relevant. Usually, a plug-in interface allows for categorization of the parts as 'mere aggregation', but the information you provided so far is insufficient for confirmation of that assumption. May 13 at 6:15

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