| http://www.w3.org/ns/prov#value | - There is a cost for them to ingest, manage and lend even free books (Adobe charges libraries for each lend, even of free books), so they are unlikely to want free books that are not going to get read (there is a need in the marketplace for a free open source DRM checkout system that libraries can use, but he is a matter for another time, and some entrepreneur other than yours truly).
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