Question About Security in PDF Files

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I want to protect my pdf against people who wants to change the information so I need a solution that I'm sure that nobody can change anything in my pdf! Only Print can be allowed!

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 decrypted
4. You can choose by check Add Security. check "Use a password ro restrict", set Change allowed value to "None" ,set Print allowed value to "High Resolution"
5. Clicking "Save" or "Save as ..." button to set security to PDF files

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