Protect PDF file to open only in one machine.

Hi. Friends.
In my project I have to protect my PDF file such that once the user download the PDF file in his machine it should work only on his/her machine. Trying to open file in other machine should be restricted. All this things I have to do using .NET technology.
Any help or suggestion would be highly appreciated. Thanks.

Thanks Bernd for your suggestion. I will try to do using DRM

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