Originally Posted by Phanx
This is only true for addons licensed under an open-source license, Creative Commons license, or other terms that allow it. If an addon doesn't specify any license terms, it defaults to "All Rights Reserved" and copyright law does not allow you to distribute modified versions of it.
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Doesn't significant change in the code as sometimes required for bringing an addon up-to-date give it a new copyright of its own? This was discussed recently
here. I know same kind of rule applies when songwriters make parodies of existing songs.