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If not specified, yeah, assume it's full copyright. I have seen a couple explicitly list an open source license, in which case you can look up exactly what you're allowed to do with the code. Many open source licenses do allow for all the way up to copying the code to make your own tweaks and re-releasing it.
On the flip side, if the authors do let you use their code (in whole or part), consider also giving your changes back. Perhaps that exact feature is on the author's backlog and they just haven't had time to implement it yet.
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