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THANK YOU! Someone who actually asks!
Legally, copyright applies to addons the same as it does to any other intellectual or artistic work. Unless explicitly specified otherwise, addons are ARR.
Speaking realistically, if you take 1 line of code out of 500, chances are no one is going to come after you about it (but not impossible!). And some things are going to be extremely similar no matter what you do, since everyone is working from the same API.
Ethically speaking, talk to the authors in question. Most authors don't object to you using parts of their code if you just have the common decency to ask first, and if you give credit where credit is due.
All of that said, I am NOT a lawyer. I am speaking purely from my 12 years of experience dealing with this sort of thing as a non-lawyer but someone who cares about protecting authors and their copyright, but do NOT take anything I've said as actual legal advice.
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