PDF Encrypt is an easy to use utility to encrypt your PDF documents, which can reduce the risk of distributing confidential and sensitive information. Besides, it can also merge multiple PDF files into one PDF and modify the PDF author, subject,title and keywords. --------------------------------------------------- Now, Support macOS Sierra. Key features: **Prevent opening and viewing PDF without entering the correct open password. ** Prevent printing of the document. ** Prevent copying and changes to the document. ** Set PDF information:You can set meta data for the PDF, which can protect your copyright in your work, such as title, subject author and keywords. ** Merge multiple files into one PDF:You can merge a large amount of origin files into one PDF file. ** Compatible with all common PDF readers, such as Preview.app or Adobe Reader. ** Batch convert as many PDF as you like.