Got suggestions, but I don't think you'll like them.
As far as I see, you have two options only:
- You either need a custom-made, expensive, proprietary solution.
- You need use Windows Media format, and not QuickTime.
Did a quick look. Not only do none of the DRM services handle QT (because it has none) but a look through the search engines only talk about (as you said) people trying to crack Apple's own DRM, but no where is there the ability for folks other than Apple to use it.