In context with IT security it is suggested to encrypt data on portable devices like USB-sticks, so if they get lost the confidential data does remain secret. But what if they confidential material is a paper which I want to read on eReader like a Sony PRS1 or Kindle? Is there a way to password protect certain books to limit the access or maybe to lock the whole eBook?
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Kindle comes with a screenlock password, though I doubt it encrypts any data.
Sony PRS1 might also have the same feature.