VS 2013 / PDF Protecting / Stamping And Locking?

Jun 9, 2015

I have an ASPNET Application (C#) that runs on my company intranet. This application allows the users to attach PDF files against records.

I am trying to get that PDF uploaded in such a way that whenever the user initially uploads (the uploaded PDF will always be unlocked PDF), the user name would be stamped on the PDF file and the files is locked by my application so that the user cannot change the PDF again, even when having a PDF Writer. Whenever required the application should allow the user to unlock the PDF and then allow the user to edit the PDF.

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