Pdf Protector 1.5.0 -

If you do not have a specific installer for version 1.5.0, similar functionality is built into most operating systems and professional suites:

: Many versions utilize high-level encryption like 128-bit or 256-bit AES to ensure that once a password is set, it is virtually impossible to bypass without the key. PDF Protector 1.5.0

Password protect PDF and encrypt a PDF for free | Acrobat - Adobe If you do not have a specific installer for version 1