My usb port in my car doesnt read music from my flash drive

[Adrian_89]

why my usb port in my car does play music i transfer from my lap top, it says protected and skipped , but it play the same music that i have in another Usb that i transfer from my desk Pc

 

[PhilFrisbie]

What format is the music in? MP3, something else?
Where did you get/purchase the music from?