Amazon movies are DRM protected and locked to the device they are downloaded on. Removing the DRM or attempting to may be a Federal crime in the USA under the Digital Millennium Copyright Act. Consult an attorney before you commit yourself publicly to such things.
Check the license on any other movies you "bought" before you get creative. (You licensed them, you didn't buy them.)
NOTE: I do NOT speak for or represent Amazon in any fashion. This is a customer to customer forum.
Disclaimer: I have examined any sites I provide links for and have determined them to be safe but I make no promises about safety, content, ads served or anything that might make you clutch your pearls in horror. Use discretion clicking on links provided by total strangers such as myself.