Movie "based" on an RPG

Quick summary: my colleague wrote a game in 1996, still in-print, the name and premise of which are now being used in a movie without his consent:

http://www.lategaming.com/2008/05/20/the-23rd-letter-in-film/

Note: I am one of the authors on LateGaming, but not the author of this blog post. I'm just curious to find out what people think. Comment here or on the blog.

I think your friend has an uphill battle to prove a case like that. I do, however, wish him luck.