[cd34]

For protecting .wmv, yeah, Microsoft doesn't like to support other platforms. Something about a lack of a revenue stream.

Helix (real network's spinoff opensource code) does support DRM on multiple platforms including embedded processes. But then, you'd have to use RealMedia codecs which some people dislike.

Apple does have their AAC container which can be wrapped around quicktime movies, but, I haven't seen any publically available DRM solution from them, unless you count ITunes.

So, DRM for .wmv pretty much requires Microsoft's Windows Media Player. For linux, you can run it in Crossoffice/Wine. As for Mac, I don't think there is a freebsd emulator/api other than vmware, at which point you're running windows anyhow.