Can you not use DRM songs in an iMovie or FCP/FCE project?
Can a DRM song not be used in Keynote?
Yes, of course, but that's short-term thinking. It's entirely conceivable I might ditch OS X at some point and want to create a presentation or movie on a Windows or Linux system. I just don't want to have to worry about these limitations.
And sorry, but if that movie or presentation or other sort of project involves any sort of non-personal use, ie. public exhibition, entrance into a festival, used to raise funds or otherwise promote your own personal enterprise endeavor (ie. commercials or sales pitches), then you owe the artists/record co. royalties, or at the least, some sort of recognition/permission.
Right, but I was thinking specifically of home movies. I'm not talking commercial. If I was doing something commercial, I would want better quality music than 128kbps AAC from the iTunes store.
But what uses I'm thinking of isn't even important. The point is that at some point in the future I may want to use the music in some way Apple hasn't thought of or allowed, and it would be a hassle for me to burn the music to CD and then rip it to unencumbered AAC or MP3.
Here's another example. A while ago I was playing around with playing songs in reverse. You know, how they have "satanic" messages. I had a good time fooling around with different songs, playing them backwards. Can I do this with DRM-encumbered AAC? I don't know. Not knowing that puts me off buying DRM-encumbered music. It's also an example of a (fair) use I wouldn't have been aware of when purchasing the music, had it had DRM.
I also buy albums, and not songs. So given the choice between buying an album on iTunes with DRM and buying a CD without DRM, I choose the CD.