There are many reasons why you want to encrypt your PDF documents. But what is the simplest way to achieve it? Here, we could like to strongly recommend Coolmuster PDF Encrypter for Your reference. With it, you can encrypt your PDF files anytime you want.
Set User Password (Open Password) to PDF to prevent PDF from opening directly.
Add Owner Password to a PDF document to protect PDF from reuse.
Support 3 different encryption systems: 40 bit RC4, 128 bit RC4 and 128 bit AES.
0 bit RC4: This is the lowest password protection which allows users to protect PDF document from printing, copying or editing individually.
128 bit RC4 is higher than 40 bit RC4. It offers more detailed options for use to apply restrictions for PDF document.
128 bit AES is undoubtedly become the highest password protection levels. It means Advanced Encryption Standard that gives stronger security measures to your file.
Add User Password: You can set just a user password to control the opening permission of your PDF. Only those who know the user password can open your PDF.
Apply Owner Password: You can control the access permissions like copying, modifying, and high quality printing, with an owner password.
People who always use PDF, people who want to Encrypter his PDF, people who want to protect his own PDF.