Google Movies service is just another application running on Android.
If you had "Dsl Movies" application for Android (or iOS or Windows) you would have a right to protect your service from people trying to watch the movies for free or extract them from your service and post them on the internet.
Why do you think that Google has no such right to protect their movie service?
As to general snarkiness about openness of Android: please come back when you can download source code to iOS or WP7 or BlackBerry, compile it and then install on your device.