What is NON-DRM PROTECT FILES AND HOW DO I CONVERT THEM ON MY LG VENUS 8800 AS

RINGTONES??? I downloaded the Bitpim and had luck creating my ringtones and uploading them on to my phone but when i try to set my ringtone it says NON-DRM PROCTED FILED. Can anyone help me please and let me know how to fix this. So close. lol