I think my problem with this whole concept is that the mod author may be able to claim copyright over their work, as in literal work, but we're talking about specific characters or locations to which they do not own the copyright. To over simplify, if I draw a picture of Han Solo, post it on the internet, someone else downloads it, displays it on their webpage with a credit to me, and I complain that they've infringed my copyright to my unlicensed use of the character seems hypocritical. That is why my unqualified opinoin to this collection is that it seems to fall within fair use. I could expound more on my thoughts but I don't think it is necessary for most other than CM to catch my drift.
"I would rather claim to be an uneducated man than be mal-educated and claim to be otherwise." - Wookie 03:16