Set owner password and change permission settings like printing, copying, modifying, annotation adding, PDF form filling, etc. Set user password to protect PDF from opening. Here in this article, we suggest you try Coolmuster PDF Encrypter for Mac, an alternative method to encrypt PDF in a few simple click, with different encrypting options provided. But Preview’s PDF encryption strength is not that perfect. As we all know that Mac’s Preview application can encrypt any PDF file without downloading any software. When dealing with such PDF documents, it is necessary to encrypt them in order to protect the contents of the PDF. There may be confidential information included in your PDF files that you want to show it in public.
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