Granted the PDF converter seems to have some trouble with graphics PDF's, but for books the converter works very well.
If you read some of the Kindle discussion groups, you'll see people complaining about "no backlighting", and then a few days/weeks later they will be lauding the fact that it has no backlighting.
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.
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