I am currently running Ubuntu Gutsy and have been able to get around the whole Adobe DRM issue using Wine.
First, I downloaded and installed the latest version found of Wine found in the repository.
Second, I downloaded ies4linux to install IE 6.0 in Wine.
Third, I download Adobe Acrobat Reader 7.0.9 for WinXP from www.adobe.com
. Firefox automatically ran the file through Wine and the install was successful.
Fourth, I went through IE 6.0 to http://aractivate.adobe.com
, signed in using my Passport identification, and requested to install on a new computer. I followed the steps, and eventually it asked me to download a file with extension ".edn". I saved this to my user directory then exited IE 6.0.
Fifth, I opened Adobe Acrobat Reader 7.0.9, via Wine, and opened the ".edn" file I saved in the previous step. Adobe Acrobat Reader then goes through the process and verifies all the credentials. Make sure you have a working internet connection!
My online university provides the course E-Books using DRM PDF files. The whole process is initiated through an "ebx.etd" file (which looks just like an XML file) which Adobe Acrobat Reader uses to verify your identity. I download this ".etd" file, using any browser, and save it to the home directory. Then, through Adobe Acrobat Reader via Wine, I can open this file and the PDF file with DRM will be downloaded and viewed anytime you wish.
Hope this helps!