The writing is on the wall: three formats -- Adobe DRM for ePub/PDF; Amazon DRM for azw (a format formerly known as mobi); and non-DRM publications. Any other DRM formats should be allowed to die gracefully. Ideally, WHSmith (and other vendors in the same situation) will keep the abandoned titles in your account file and allow you to download a DRM ePub version, if available from the same original publisher. Even better: an upload/download tool which would allow you to send your old DRM files to WHSmith and they automatically convert and download back to you as DRM ePub.
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