You can copyright a release of code, but you can not copyright the objective of said code or the method in which it is achieved.
If this were true, there would only be one forum software written for php.
So nothing is stopping people from taking an abandoned mod, studying it, and making an improved/updated version using the concepts the original describes. There no technology patents in question here so it's not like reverse engineering an iPhone and having apple chase after you.
So why not make a better version of a mod instead of changing a few lines of code? Too lazy? Don't do it.
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