I find it somewhat silly to write that iMovie removes copy protection just because you can do a re-encoding of AAC files with it - coupled with the quality losses that come with re-encoding. It becomes particularly silly when you know that iTunes itself can do a re-encoding of AAC files to MP3 - and also removes the DRM in the process. But of course that way the headline sounds much cooler ...
At heise online news you can find the original article.