If you add a track from an audio CD into your iMovie HD project, you may be unable to eject that CD while iMovie HD is running. In such cases, you will see a message like this one:
This can happen if you're using iMovie HD in Mac OS X 10.4 Tiger.
To eject your CD, save your project and quit iMovie HD. You will then be able to eject your CD normally. After the CD is ejected, open iMovie again and resume work on your project.
If you have a number of CD tracks that you wish to add to an iMovie project, you can avoid this issue by first importing the tracks into iTunes. Once they are in your iTunes Library, they will be available for use in iMovie HD without needing to have the CD in your computer.
A note about copyrightThis software may be used to reproduce materials. It is licensed to you only for reproduction of non-copyrighted materials, materials in which you own the copyright, or materials you are authorized or legally permitted to reproduce. If you are uncertain about your right to copy any material, you should contact your legal advisor.