Use Mobipocket software to convert PDFs to that format so you can read them on Kindle.
DRM is not to prevent other files from being readable on the Kindle.
A cheap casioppeia allows me to read ebooks around 2001.
Plenty of free e-books in Mobipocket format show up fine 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.