Historically, it has been software producers such as Adobe who pioneered the PDF file format for writing eBooks. Their software can be configured to constrain/restrict certain functionality of PDF readers. You may have seen this before where you receive a PDF book but are perhaps unable to copy/paste any of the text. It is possible to even restrict the user from printing out hard-copies of the document. This is DRM in action.
Most PDF creation applications now have this functionality (for example, Adobe Reader and Microsoft Reader). Microsoft added the options of imprinting PDF files with the purchaser's meta-data (information) to discourage the customer from sharing their PDF purchase and facilitate hunting down file sharers.
Sociable
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