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PDF Secure Tool(A-PDF Password Security: http://a-pdf.com/security/password.htm ) is a useful and simple program that guarantees your right of your own PDF through setting the password and permissions for PDF. In this way, only the people getting the password can share your PDF. For more details：http://a-pdf.com/secure/index.htm .
Clipping is a handy way to collect important slides you want to go back to later.