Secure and protect your PDF documents in such a way that it requires a user to type in a ‘Document Open Password’ or ‘User Password’ to view it in PDF reader software. This is the simplest way to filter out your intended recipients from malicious users. With a password, your PDF content is locked and act as a first security layer to secure your information.

Additionally, lock down your PDF documents by setting a permissions or master password and restrict printing, editing and copying content in the PDF. Your intended recipients don’t need a password to open the document (unless a ‘Document Open Password’ or ‘User Password’ is enforced on that PDF). However, they do need this permissions or master

Product Summary
• Set security restrictions to PDF files with a master password e.g., ability to edit or print.
• Secure PDF documents by setting a user password for viewing.
• Convert PDF documents to grayscale
• Define multiple security profiles based on your projects, users or regions.

https://www.virustotal.com/gui/file/ca18a6ee78a4d56b25fdf7f2ac4bd77aba9833671e63237ae4c5235ed7051c74

https://www.virustotal.com/gui/file/b761884871a9f340ac0dd227c1708cd4da890d82228d65d84bd7a7e599571c3a