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I think you would need to licence the DRM scheme you wish to use (from Adobe/Sony or whoever). For example you can't DRM a song for playing on an iPod without using Apple's DRM scheme. Try searching the Adobe website.
FWIW, I think for purchased content (as opposed to rental/subscription content), DRM is horrible and hinders the end user, so I don't recommend it. It's trivially easy to crack, and therefore only has a negative effect on those who actually buy the media legitimately and want to use it in a reasonable way (e.g. on multiple computers/devices they own). For example, you can download pretty much any music CD illegally with no limitations on usage, whereas if you buy a DRM'd copy of the album legitimately, you won't be able to use the music on any device that doesn't support the DRM scheme.
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