Yep. Fanfiction, fanart, fan-made anything without a licensing deal is all a violation of copyright and, if the author of the copyrighted material cannot argue before a judge that they did not know it existed, they can loose their copyright. They have to stomp on anyone they can be proven to know about...Which, for a company as big as GL's, means everyone.
Or, as it was put better than I could:
http://weberfaq.thefifthimperium.com/
Go to number 1.4, or search for 'fanfiction'. It'll be the first one.
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If I only could remember half the things I'd forgot, that would be a lot of stuff, I think - I don't know; I forgot!
A* E* Se! Gd! $-- C-^- Ai** M-- S? Ss---- RA Pw? Fq Bb++@ Tcp? L++++
Some of my webcomics. I've got 400+ webcomics at Last count, some dead.
Sig updated to remove non-working links.