The "Plus" designation signifies that the files are free of Digital Rights Management (DRM), allowing them to be played on non-Apple devices without restriction. Technical & Historical Context
A common misconception is that higher bitrates always mean better sound. However, the AAC encoder used for iTunes Plus is significantly more efficient than the older MP3 format. Itunes Plus Aac M4a Sites
For serious audiophiles, public websites are often avoided in favor of private communities. The "Plus" designation signifies that the files are