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Well, not having any license means that you still retain full copyright for it. (In the US)

I’m not a doctor or a pharmacist. But just because it has the same ingredients doesn’t mean it is the same. The way the medication is packaged, what fillers it has, etc. may have an impact on the way it works. Anecdotally I’ve heard of people having a different reaction to namebrand and generic because of some of these factors.