I am lucky enough to get a chance to work with DRM for continuously two projects, one for music portal for a Singapore based Telecommunication Company and another one is US based Paramount Pictures!! DRM was very strange for us at CIGNEX when we did it first time. It was nice experience to integrate Microsoft based feature with our Open Source technology like Drupal and Magento. We integrated DRM with Drupal for music portal and now we integrated DRM with Magento for Paramount Pictures. Now let me talk about DRM in more detail...

Open Atrium is an opensource team intranet built using Drupal core, contributed modules and some custom modules. A decentralized features model that has emerged from to Atrium development. The focus of this model is to enable easy replication of complex configuration between sites.

Recently CIGNEX has successfully rolled out an enterprise level CMS solution for a major insurance company in USA.  CIGNEX integrated Drupal front-end and Alfresco back-end to create a high-performance, low-cost, flexible and scalable solution.
 
Why to use Drupal and Alfresco together is the best-of-both-worlds: You get the speed of development and flexible user interface that Drupal brings plus the strength of a scalable enterprise repository that Alfresco provides.