DRM copy protection for doc files [closed]

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Does anybody know of a solution to copy protect ms word documents. We need to limit the opening of the document to the machine to which it was downloaded. Ideally we will have license server that can issue licence tokens per client

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Microsoft Office has incorporated an information rights management (IRM) since Office 2003. You can find Microsoft's notes on the IRM implementations for Office 2003, 2007, and 2010. For users without a DRM server, Microsoft provides a free service using Windows Live IDs.

AegisDRM offers a commercial solution, Protector add-in for MS Office (PaM), but no direct information about pricing is listed.