Open the PDF in a PDF reader that supports password entry
Enter the correct password when prompted
If you know the password, use the PDF reader’s Print to PDF or Save As feature to create an unencrypted copy
Use a PDF editor with permission to remove security settings if you have authorization
If the file is protected by owner restrictions, enter the owner password to change security settings
If you do not know the password, contact the file owner or sender for access
Use the original source file to recreate an unencrypted PDF if available
Verify that decrypting or removing protection is allowed by law and by the document owner