Apple uses a ton of BSD'd code in OSX. You could and probably should talk to a lawyer, however, some of those licenses are so short and simple, you really don't need to for some of them, especially BSD. You could try these websites for basic legal info:
www.eff.org/ www.opensource.org/licenses www.fsf.org/ [ December 09, 2008: Message edited by: Rusty Shackleford ]