Sign & secure PDF files

The built-in security features of PDF give you exceptional control over the PDF files you create: you can encrypt and secure PDF files to prevent unauthorized access, restrict sensitive operations, and more.

Nitro PDF Professional supports the same password and certificate security that both Adobe^® Acrobat^® and Adobe Reader use, so whether files are secured in Nitro PDF Professional or another application, secure PDF files can be distributed amongst trusted recipients reliably, no matter what PDF viewer is used.

The PDF encryption in Nitro PDF Professional locks the contents of your PDF files with 128-bit RC4 or 128-bit AES level encryption, guarding against disclosure of sensitive information in the case of loss or theft.

Secure PDF with passwords

Passwords give you a quick way to to restrict access to and usage of your content to people who have the password used to secure the PDF file. With Nitro PDF Professional you can use two different types of passwords:

• Open passwords lock your file so only people with the correct password can open the file.
• Permission passwords lock particular functionality when a user opens your file. For example, you can stop someone copying text from or printing your document.

Secure PDF with digital certificates

Digital certificates let you secure PDF files so they can only be opened and used by people who have exchanged digital certificates. Certificate-based PDF security has many advantages over password-based security:

• Certificates cannot be copied or shared easily.
• It removes the need for approved recipients to remember and type a password each time they use the PDF file.
• The one PDF file can use different security settings for different file recipients. For example, you may grant one person editing and printing privileges, while another is limited to viewing privileges only.

Lock PDF content and control usage

With Nitro PDF Professional you choose what others can and can't do with your PDF files — document viewing, printing, editing, and copying can all individually be turned on or off. Using these permission settings with certificate-based security gives you even greater flexibility as you can set different permissions for each of your recipients. Nitro PDF Professional lets you to restrict printing, content copying and modification, commenting, accessibility, form filling and signing rights on a user-by-user basis.

Digitally sign PDF files

Digital signatures in PDF files work much like traditional 'inked' signatures but have additional benefits:

• Faster turnaround. Digitally signing can greatly reduce the time it takes to complete a formal document sign off process as the document can be exchanged between all parties electronically.
  
• Tamper proof. Digitally signed documents have a higher level of integrity and are far more tamper proof than paper.

When you sign a PDF file, a snapshot of the file content is tied to your digital certificate and encrypted inside the document. When it is reopened again, Nitro PDF Professional (or another PDF viewer) validates each signature, checks for changes to the file since it was signed, and reports if any illegal changes have occurred.

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