PDF-XChange Tutorials

How to Secure your PDF Document...

Encrypt and control access to PDF files as follows:

Prevent printing PDFs

Prevent copying text and graphics

Prevent opening without a password

Prevent editing (yes, PDFs can be edited)

See how it goes...

• Open your text program (for example MS Word), choose "File / Print" and activate the "PDF-XChange Standard" printer (1) if it isn't already activated.

• Then click on "Properties" (2)

• Click "Security" (1)
• If you only like to secure your PDF document with a password (so it can only been opened with this password) click "Use PDF security" (2) and choose the option "Password Required to Open the Document:" and / or "Password Required to Change Permission and/or Password:"
• More security option can be defined under "Document Permissions" (3)
• Under "Digital Signing" you can signing your document with a digital signature

WIKIPEDIA.ORG: A digital signature or digital signature scheme is a type of asymmetric cryptography used to simulate the security properties of a handwritten signature on paper. Digital signature schemes consist of at least three algorithms: a key generation algorithm, a signature algorithm, and a verification algorithm. A signature provides authentication of a "message". Messages may be anything, from electronic mail to a contract, or even a message sent in a more complicated cryptographic protocol.

Digital signatures are often used to implement electronic signatures, a broader term that refers to any electronic data that carries the intent of a signature[1], but not all electronic signatures use digital signatures.[2][3][4] In some countries, including the United States, and in the European Union, electronic signatures have legal significance. However, laws concerning electronic signatures do not always make clear their applicability towards cryptographic digital signatures, leaving their legal importance somewhat unspecified.