Sorry, Matt.
Currently there's no way to export anything with DRM built in. You can limit access to the downloading of the files pretty easily, but once they have the file in their hands...they can pretty much do anything they want with it.
That being said, there are several services out there that can help you sell your content and restrict it's viewing. Google Video is probably the easiest. You can upload your conetent to them and set a price for how much it will cost the viewer to watch it.
Check it out.
http://video.google.com/support/
Good luck!
Jon
TreeLine Productions
Fort Collins, CO USA
Currently producing these popular podcasts: