Regrettably, IREX  Technologies is not permitted by Mobipocket to maintain the Mobipocket DRM viewer on any IREX device that runs Adobe DRM (ePub).
Therefore there will be no Mobipocket DRM support on the Digital Reader 800S or SG. Also there will be no software release supporting Mobipocket DRM in the future.

The IREX iLiad has been specially designed for Mobipocket DRM and therefore will be the only IREX reader to continue to support Mobipocket DRM reading.

On the IREX DR1000 series, currently supporting Mobipocket, a choice will be given to you to use Mobipocket or Adobe DRM at the moment that the E-Pub/Adobe DRM upgrade is offered. As explained in the blog posting of August 26.