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DRM stands for Digital Rights Management.
It's not about "restricted"; it's not about "protection".
Adobe's ADE, and the way it is implemented using the Overdrive facilities for public libraries is a great example of "management". It provides for tracking digital rights from the library to the borrower (temporarily removing the rights from the library and giving them to the borrower) and then tracking the "return" of the item from the borrower to the library. Multiple copies can exist and remain -- but in the expired borrower hands, the management scheme renders the item useless, whereas the library copy is magically "whole" again and read to be loaned out again.
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