Playing Protected Content

Hello! I have finally joined the 21st century and can check mixes in the car with a USB stick. Bye Bye 4 thousand CD's!

Problem is my "Sync" system (in the Ford) says it can't play protected content.

It plays my Itunes purchased references, but not my bounced AIFF files.

FYI, I'm dragging the files directly on to the USB drive. (Scandisk Cruzer micro 2GB)

Contacted Ford, they said it's a coding issue with Itunes. Contacted Itunes, they said it's a coding issue with my DAW. So here I am.

Any suggestions on how to get these files to play?

Pro Tools 11..3.0
Macbook Pro OS 10.8.5
2.2GHz Intel Core i7