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But logic dictates you have to take it on trust to a certain extent; you can't prove a negative. When you used the Avalon codebase, for example, you did so via a licence - but how could you be sure they hadn't included small amounts of material copyrighted to someone else? When other people worked on your Rapture engine, how could you be sure they didn't borrow a few little bits and pieces from elsewhere?
You can't - but there's no reason to believe that either of the above were the case. If a licence states it gives you permission to use X, and you have no reason to believe it doesn't, then I don't really see what else you can do - unless you write everything yourself.
It's not plagiarism though, it's a contribution explicitly given to the Diku team for the purposes of being added to DikuMUD - and the contributors also get a mention in the credits.
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