Bell did this with their telephones in the 60's and 70's. Customers could not own their own phone while using Bell's service. They even went so far as to stamp "BELL SYSTEM PROPERTY" into the molding. Even after they allowed 3rd party phones, they still charged a monthly fee for the privilege. It wasn't until their divestiture that they began allowing their customers to use their own phones without incurring a fee. Though it seems that was due to competitive pressure more than legal pressure.

http://en.wikipedia.org/wiki/Model_500_telephone#Ownership_a...