I don't know if this has been discussed before, but I just found this out -- when they mean "up to 3 computers" they mean ONLY 3 computers even though u have 3 different songs on 3 computers. For example, I have 4 different songs on 4 different computers. I can only authorize 3 of them while the 4th one with a song that's not on the other 3 can't be played. Soo... u can only authorize 3 computers with ur account... NOT authorize songs on 3 computers.. I get it now.. Sorry.. been out in the sun too long.