Coolmuster PDF Encrypter for Mac allows you to easily encrypt any PDF files with the user or owner password as you like. Set PDF with owner password to prevent the file from printing, editing, coping, and changing. 3 encryption modes to protect your document well. Instantly add a password to a batch of PDF documents on Mac at one go. We know that PDF files can be protected by two kinds of password: User password and Owner password. With these password, you can protect your PDF files from opening, copying, editing, printing. A good PDF Encrypter software will features the function of adding both user and owner password to PDF files easily, so does Coolmuster PDF Encrypter for Mac. Difference between User password and owner password. User Password: If a PDF document is under User Password protection, you cannot open it without the correct password. Owner Password: Owner Password is needed when you don't want any other people reuse any contents of the PDF document. No matter readers want to print, copy or edit the PDF document, he/she must enter the proper password.