Boin Boing has an article about problems with legally acquired DRMed eBooks. The customer bought an eBook for $172 and when he installed a new version of Acrobat, he no longer can read it...

See also Espen log that has more information, including reply from the customer support of the vendor, given that the publisher did not even dare to reply.

Perhaps we should just Free Dimitry Sklyarov and say NO to DRM.