PDF Password is a new command-line tool makes it easy to password-protect PDF documents without needing to upload your PDF data to a cloud platform. Features include:

• Support for all modern PDF encryption standards
• Simple command-line syntax
• Batch mode for multi-file encryption
• Data always stays local

Under the hood, PDF Password uses the same technology that powers Secure PDF, our premiere PDF security library.  

Download from pdfpassword.com.