How exactly would this work? Would the movie studios ask you nicely to remove the file from your computer after three days? I'd love to hear a technical answer that contradicts this, but don't see how a DRM-free rental could ever be possible.
Rental is the oldest form of DRM. That's basically how it works.
Isn't that exactly what stores do that rent out movies on physical media?
I don't really see how you could rent streaming movies without some form of DRM in place. I would hope no one expects that.
Ownership: My copy plays from my device (of my choosing) whenever I want.
Rental: Their copy plays from their server when they approve it.
Its the confusing of those two ideas that all these problems stem from.
Can't we all just get along?
For buying I would like the drm to go bye-bye. They can watermark it for all I care, as long as its a plain file with no drm is what I want for the purchase price so I can move it about like the songs I buy from amazon/itunes. That is basically my viewpoint as well.