Bookplate: also known as ex-librīs [Latin, "from the books of..."], is usually a small print or decorative label pasted into a book, often on the inside front cover, to indicate its owner. Simple typographical bookplates are termed 'booklabels'.
What if instead of putting people in DRM jails (which is what the book industry seems to be heading for despite the music painful e-adventures), e-books were without DRM but carrying the OpenID of their owners?
This is a simple idea which is not really new: Ex-Libris have been around for a while!
Instead of penalizing e-book buyers and readers with ineffective DRMs, why not make them proud and responsible owners of the content they download?