Computer Games manufacturers have tried and failed, in the main, with their DRM. Most of the games are cracked and copied within a short time of release, sometime even before release.
It would be remarkable if publishers came up with something to protect books that hasn't been tried already.
A Blue Sky solution to lending your own books would be to implement some variation on the OverDrive program that lending libraries use. You could lend your copy to someone else via a Sony / B&N / Amazon library server, for a specified time.
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