One fairly easy way to get around this is to burn those albums CD and then rip them back to mp3. This does away with the DRM. I do this with everything I buy from itunes and then delete the DRM file.
You can do this all from itunes, so I’m assuming apple is ok with it.
If you are an audiophile, this may be unsatisfactory, since there must be some loss going on, but if you have normal ears like me, then it will sound fine.
Good Luck