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Dedee is the first PC/Mac software in the world allowing ebooks signing (all ePub, including those locked by DRM). A dedeecation (ie. dedication made through Dedee) is authentified and any attempt to modify it afterward will be detectable by Dedee. Dedee allows to sign at anytime (even long time after the reader purchased his ebook) and everywhere (even in a fair without connection or at home). Dedee is independent of any online bookstore. Dedee, it's one lifetime license per author or publisher name (the latter being reserved for marking of review copies)