Are you kidding ProDigit? That one will be trivial. You could simply set up the reading software to check the time on the device, and then ensure that the device has to synch its clock with a central server. Sure you might be able to game the system for a bit, but as soon as you connect to the internet, it checks the time, and if you lease on the material has expired, the material is deleted from your readers. At the very least, it will prevent the readers from reading expired material (if you still have a copy, you could deDRM it, but we are assuming people are going to stay legal).
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Bill
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