EFF Publishes Online Music DRM Guide
“There is an increasing variety of options for purchasing music online, but also a growing thicket of confusing usage restrictions. You may be
getting much less than the services promise.
“Many digital music services employ digital rights management (DRM) — also known as ‘copy protection’ — that prevents you from doing things like using the portable player of your choice or creating remixes.”
Electronic Frontier Foundation. The Customer Is Always Wrong: A User’s Guide to DRM in Online Music. No date.