Heck, Star Trek even called the tablet computer a "PADD" (Personal Access Display Device).
http://www.ilounge.com/index.php/news/comments/cbs-legal-thr...
I am the author of the LCARS Reader iPad app and have been bullied by CBS many times. Their own general council however admits to having no legal basis for their claims.
What CBS does have is expensive lawyers that usually get their way.
Unlike George Lucas, who makes people license the word "droid".