No. They can only be played / manipulated on the same machine as they where created on.

Quoted from Microsoft's WMA page:

The content you are trying to play is protected with a digital license. The key to open this license resides on the PC which originally recorded this file from CD, and the file can only be played on that PC. If you are attempting to play the content on the PC which originally recorded this file from CD, then the license file is missing or corrupt and you'll need to re-record the content from the original CD. The software used to record the file from CD uses a digital rights management system to help protect the copyrights of musicians and songwriters. This system, developed by Microsoft and called Windows Media Rights Manager, encrypts the music files you record. Use of the system helps prevent accidental violation of license terms and conditions set by a copyright owner.