Now letís be clear right from the start that if you want to have any kind of control over the content of an electronic document you have first of all got to use encryption. But encryption is only the start of implementing a DRM service. Poorly packaged encryption, badly thought out licensing, integration that exposes weaknesses in the packaging of the method for displaying the document, are all ways in which even the most powerful encryption system can be made useless.
And, of course, there is the very important question about what is actually encrypted, and what, if anything, is not.
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