DRM is not to prevent other files from being readable on the Kindle.
Hack let you convert encrypted Mobipocket files that were intended for another reader so that that work on Kindle.
The Kindle is already able to read more than just Amazon DRMed content, it can handle a number of formats.
Devices like the Sony Reader, Cybook, and Kindle DO NOT have glowing LCD screens.
A revolutionary portable reader that wirelessly downloads books, newspapers, magazines and blogs to a crisp, high-resolution electronic paper display that looks and reads like real paper, even in bright sunlight.