Books and movies, no dice.
I wanted to do this with my music and succeeded. First, open iTunes on an authorized computer and sync all your music with iTunes Match. It costs $25 a year for the service, yes.. but with over 5,000 songs, that ain't much. 😉
Once you have synced and iTunes Match has found all your music, download the new 256 kbps versions, create a smart folder with just those versions. Convert to mp3. Recreate the smart folder with only the mp3 versions, so as to eliminate any DRM versions of your old music. Click on one, select all, drag and drop to a new "music" folder on your desktop.
You now have drm free unlicensed versions of all your old music library in mp3 format.
Then de-authorize your computer from the old Apple ID (or use a different computer that is running iTunes witout an Apple ID as I did.)
You are free to import and add the mp3s to iTunes under your new/ different Apple ID. Worked for me, but it did take some patience, and time. Well worth it though!