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 supports Mobipocket files directly. You don't need to write a script to do that.
Use Mobipocket software to convert PDFs to that format so you can read them on Kindle.
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.