Linux command line software to convert videos to OMA DRM protected videos

Hi,

I was looking for a linux command tool to convert videos (3gp/h263/rm/mp4/wmp) to oma drm format (forward lock and combined delivery). Is anyone aware of such tools that can be used in linux? i searched all forums and only thing that i got was how to removed drm protection from file and never on how to encrypt.

Greatfull if anyone can throw light on it.

Thanks,
Hari