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Please note that Microsoft Office IRM is not intended to secure a document. It's intended to manage rights, but does not use strong encryption and should not be exclusively used for sensitive documents (it's like a lock on a filing cabinet - you could pick it easily, but it's there to let you know you shouldn't). There is no feature currently in office that ...


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This is exactly what Microsoft's IRM (Information Rights Management) product is designed to address. However, as pointed out by others, the file on its own cannot achieve what you are trying to do, so you will need some infrastructure, which MSFT calls the Rights Management Server (with the delightful irony of being Rich Stallman's initials). And this ...


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Short answer: in general, no. Long answer: the timestamp is a digitally signed data and it contains nothing that should be private on its own. It can't be reused and, as every other aspect of the system is properly conceived, cannot be counterfeit. The critical element is that the timestamp comes from an authority that is trusted by both the initial signer ...


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It's impossible to protect some file for some time. Intrinsically, the file doesn't have any property that will allow it to know whether it's January, 1st, 2010 or 30-Feb-2050 (if February will have 30 days in 2050). What "could" know the time is the program opening it. In your case, Excel. But a program itself doesn't know about time either. It would need ...


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A file is just a collection of bytes. It cannot do something to itself on its own. You need an access restricting application, or use what is available. Because it is an excel document, any weird solution you come up with can be circumvented just by saving it locally unprotected or copy pasting. But if you still want to at least try, even if it isn't ...


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You either need to take system management seriously and use NT, or you could make an extra endpoint on your server poll the server for it's time. For example, you could send a request to the server and record the request timestamp. The server should respond back with it's timestamp, and then the client can figure out the difference here and adjust your ...



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