How about building one of those electronic diabetes finger-pricker-thingies into every eReader? The eReader could then; 1) stab you 2) do a quick DNA analysis to make sure the proper owner was opening the ebook. DNA on file could even be used to enforce a family-only lending program... just gotta make sure the right alleles line up (other than spouses of course).
Bada-bing, bada-boom.
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