Re: eBooks - is there a secure system?
Given enough resources, you could also consider deploying Adobe's LifeCycle platform.
It's an enterprise-grade tool and quite likely beyond your budget, but it shows what can be done with PDF documents when the need for controls exists and can be cost-justified:
* Provides document owners with the ability to change access rights after documents have been distributed
* Authorization software development kit (SDK) allows further dynamic policy controls (such as client IP address restriction or one-time printing)
* All activity (open, modify, print, close) on protected documents can be logged by the server and reviewed by the author of the document
* Provides the ability to grant recipients the right to access documents offline for a specified time; forces recipients to reauthenticate after offline period has expired
* Revokes access to outdated files and automatically provides a link to a current version as they are published
* Allows immediate revocation of access to distributed documents for individuals or groups in the event of termination or security breach
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