Permission caching is present in the Microsoft O/S now. You use it every time you log on with your domain account and your laptop isn't connected to the network.
Given the caching is on the machine, not in the document, electronic delivery of the document only isn't a threat. The user sharing their credential (username/password) is the threat, but DRM isn't going to protect you from that vulnerability - it isn't a digital issue, it is a human issue.
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Permission caching is present in the Microsoft O/S now. You use it every time you log on with your domain account and your laptop isn't connected to the network.
Given the caching is on the machine, not in the document, electronic delivery of the document only isn't a threat. The user sharing their credential (username/password) is the threat, but DRM isn't going to protect you from that vulnerability - it isn't a digital issue, it is a human issue.