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There are PDFs with a password. These are crackable, but not used much commercially.
Most protected PDFs you see are called Secure Adobe ebooks or Secure Adobe PDFs. They are usually described as needing (Windows) Adobe Reader version 7 or Abobe Digital Editions to read them. This is exactly the case, since the DRM has not been cracked. So these may never be readable on a Kindle. They are readable on a Sony PRS-505, since it includes ADE.
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