How Can we Identitfy : If Media File is DRM protected or not ?

Question

Hello all Technologist
Can some one help me distinguish between a DRM protected Audio/Video files on windows platform ? I don't wanna use Itune's SDK or WMF -SDK for the same . here i am looking seem general properties of Protected files which will just let me know .....if file is DRM protected or not .

Thanking you in anticipation.

Regards
Ritesh