Pdf files are important document and very popular file format. It is suitable with Windows, Mac, Linux, Android or iOS. PDF files are used to share ideas and thoughts, saving information, online form filling, etc. So PDF files are needed to be safe and secure from being copied, change, printed, filled etc. As PDF files are normally shared online, mostly you send and receive pdf files attached with emails which stores important data. Just too safe PDF files from online virus or hacker you can encrypt or decrypt your PDF files with help of PDF security which will prevent your PDF files from getting copied, exchange, filled, assemble, etc.