Readum LCP (Lightweight Content Protection)
Several members of Readium Foundation are pursuing, as a sub-project of Readium SDK, an implementation of a lightweight DRM technology. Readium LCP (for "Lightweight Content Protection") is expected to provide a plug-in module to Readium SDK as well as server-side components. Readium SDK will not require use of Readium LCP, which will be separately licensed to interested parties.
An initial specification proposal for Readium LCP was contributed by Kobo and is available at: https://dl.dropbox.com/u/896638/Kobo-EPUB-LCP.pdf. More information on Readium LCP coming soon.