@FTS: Yes. CC licenses are free, but you get only "Some rights reserved" which is, in fact, enough for me. People have to credit me and can't use my stuff for commercial gain without my permission. I usually do give the permission if somebody asks me, but I want people to ask first. Who doesn't ask will get sued.
EDIT:
Ghareeb, you should add a link to the CC license you are using for this. -_-