Copyright of music included with iMovie?

Hello everyone,

I'm not familiar with copyright law. And I never read the disclaimers when installing new software. Who does? So this was a new situation for me.

I used iMovie '11 to edit some video and then uploaded it to Facebook and YouTube. This is video that I shot but I used some of the background music that comes bundled with the iMovie software.

Both FB and YT have flagged the video, saying that it contains copyrighted material. Am I not allowed to use this music for videos I post on the Internet? I'm very confused here. Why would they provide this music if you aren't allowed to include it as part of a video uploaded to a public forum?

Can anyone shed some light on this situation?

Thanks,

Bruce