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If you write a story set in the "Star Wars" universe, it will violate Lucas's copyright. If it uses "Star Wars" in the title, then that will be trademark infrigement as well - but it will also be a copyright infrigement. The same applies to writing a story set in the "Star Trek" universe, or in the Tolkien world. I cannot simply change the names of the Tolkien races/characters and then copy them verbatum into my own stories - that would avoid the trademark infringements, but not the copyright ones. The same would apply to a well-developed "custom" theme - if you had written up a lot of information about it (and that information was used to create the area) you might well be creating a derivative work.
The link I provided earlier gives some good info on this:
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