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I want to write a few modules for ERP system, which is licensed under GNU GPLv3, and I want to sell them. However I don't want my users to be able to redistribute the code without my permissions. Considering the fact that I won't touch the code of the ERP system, but I would use it's API, could I do this? I've read a few similar questions here. However I wasn't able to understand am I allowed to do it. Here is a quote from this question:

Case 1: If you

use a library X that comes under GPLv3 or AGPLv3, use it as a library (that is, keeping it as a separate entity without copying source code from the library into your own source code), and do not modify it,

you do not have to make available anything.

But I can't understand am I using the ERP as a library or not

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1 Answers1

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You cannot link your module into GPL program if it shares any data structures. Most likely it does. Look for the system with more permissive license like Apache or LGPL.

Your quote is NOT CORRECT for GPL.

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