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Which GPL-like licence for object oriented? (lemmy.ml)

submitted 1 year ago by [email protected] to c/[email protected]

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Hello, I work on Pharo, an open source derivative of Smalltalk. Pharo is licensed under MIT hence most of my work needs to be licensed also under MIT.

However, time to time I have some projects in my free time that I made for my personal usage or for friends, and in those cases I am not OK with my work being used by for-profit project not giving anything back. I would very much prefer to use GPLv3 on those cases, but my understanding of licensing is very poor and I have been told there is a "virus" behavior on GPLv3 that may prevent people to use at all what I do, and that's not my intention.

Do you have any advice how to handle this?

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[–] [email protected] 12 points 1 year ago

If some code links to your GPL library, the whole project has to be licenced GPLv3, full stop. This does not "prevent people to use [it] at all", it just stipulates that they have to make the source available and the source of improvements they make available. Each substantial library I write in my free time is GPLv3. I want to contribute to the ecosystem and I want everyone enjoying my work contributing back to the ecosystem.

A similar licence, called LGPL, allows dynamic linking without having to make the code of the whole project available, just the code of the specific library + improvements. If for some reason you need this, I invite you to check how dynamic linking works in Pharo and read this FAQ by the FSF (and all other FAQs, it is a very clear, informative document).