Which brings us back to where we started: unless you're running a very specific version of Google's software on your phone or tablet, you can't "rent" movies on YouTube. Google - the vendor - and the studios - the rights holders - are using copyright to control something much more profound than mere copying. In this version of copyright, making a movie gives you the right to specify what kind of device can play the movie back, and how that device must be configured.Google's YouTube policy for Android users is copyright extremism
This is as extreme as copyright gets, really. Book publishers have never told you which rooms you could read in, or what light bulbs you were allowed to use, or whether you could rebind the book or take it abroad with you. Broadcasters have never vetoed the design of radios.
The extension of copyright to "configuration right" is a profound shift in the history of technology and culture. There are lots of reasons to want to run a non-stock OS on your Android phone; some versions allow you to assert fine-grained privacy controls, others add features useful to people with disabilities; others make it simpler to use cheap/free voice-over-IP for long-distance calls. There are at least as many reasons to want to redecorate and reconfigure your phone, your computer or your tablet as there are reasons to rearrange your kitchen or redecorate your bedroom.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.