Does apps that play on the word Droid need to worry about Lucasfilm's Trademark?

Question

I've noticed in recent ads that the Verizon Droid and Droid Eris have to put up acknowledgement on Lucasfilm's trademark of the word "Droid", and had to pay licensing fees to use it.

I'm wondering if an app I'm building that uses the word Droid in the naming is violating said trademark. I've noticed other apps that do it (Twitdroid), and never once considered it a problem.

The name in question would be ServiceDroid.

Answer 1

Do ELF binaries have to pay Tolkien?

I don't think a trademark on a fictional character (which is just a shortening of an English word) would stand up for a piece of real hardware. You would have difficulty convincing a judge you thought you were getting C3-PO when you ordered a phone.