How to Add Password Protection for PDF Files with 40 or 128 Bit encryption?

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How to add password protection for PDF files with 40 or 128 bit encryption?

Use A-PDF Password Security (free download here)

1. Launching the application: A-pdf Password Security
2. Select the option single PDF Document Security and push the button Next >, a PDF security setting window will be opened..
3. Clicking Browse… to open a PDF file will be encrypted
4. You can choose add security by checking Add Security, where set "Security Level" option values to "40 or 128 Bit encryption"
5. Clicking "Save" or "Save as ..." button to set security to PDF files

This web tutorial will give you an overview of the product and understanding of how easy to use it!

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