DRM refers to the fact that you can't view Amazon Kindle books on other devices (including your computer), or on other Kindles - i.e. no sharing, the purpose of DRM.
As glued to the net as we all are, there's vast quantities of content that is not available online.
DRM is not to prevent other files from being readable on the Kindle.
There are converters available from Amazon and/or Mobi for pdf and doc files.
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