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I made a modification of the R package rpart for researching purposes. The license is GPL-2 | GPL-3.

The modification is simple but it is critical for another package that I have developed. I would like to upload it to Github for reproducibility purposes.

I have two questions:

  • How should I acknowledge the authors of rpart? Is a forking in github enough? Can I include myself as an author?

  • Am I obliged to use GPL license?

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  1. You should maintain their copyright notices intact; this is required by eg GPLv3 s4. You can do this by forking their repository, or copying it to another git hosting service, or publishing tarballs; the GPL doesn't care about how you preserve them. As for acknowledging yourself, you should add a copyright notice of your own.

  2. Yes. GPLv3 s5c says you may convey "a work based on the Program" but you "must license the entire work, as a whole, under this License to anyone who comes into possession of a copy". GPLv2 has comparable language.

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