We want our documents to be secured so we are using encryption software for pdf, I've read about this encrypt pdf so I tried and download it but whenver I ran the installer it is giving me this error.

C:\Installer\encryptpdf_cmd_v2.3\encryptpdf.exe
C:\Installer\encryptpdf_cmd_v2.3\encryptpdf.exe is not a valid Win32 application.
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Hi there,
Remember that win32 application validation greatly depends on downloading source and packages, if your downloaded file is corrupt and not properly extracted it will give error in validation of application!
Go to this link to download proper and complete package for Encrypt PDF and make your way easier, " http://www.verypdf.com/encryptpdf/encryptpdf_cmd.zip "
Note:
Don't forget to completely remove previous installed encrypt pdf and remove it completely from your system, then download using this link and install, then reboot your system and try encryption again!!
Hope it works for you!!
In order to set PDF secure to keep your PDF document from being opened or change by others freely, you can use very PDF Encrypt PDF command Line Encrypt PDF command Line encrypt-PDF-command-line to help . This application is an MS-DOS oriented program
Click the following link to download the application that o need to use:
Download Encrypt PDF command line
Call executable file encryptpdf.exe in the extracted folder of the program. After opening MS-DOS interface, you can drag encryptpdf.exe and drop it into the interface, then hit Enter button to see its usage
Follow the command line template below to write your own command line:
Command line is
“C:\program Files\encryptpdf_cmd_v2.3\encryptpdf.exe” –I “C:\Documents and Settings\admin\Desktop\demo\pdf\10012.pdf” – o C:\test.pdf –w 222 –u 111 –p –c
In the command line,
–I “C:\Documents and Settings\admin\Desktop\demo\pdf\10012.pdf” describes the path of the input file.
-C C:\test.pdf is for setting the path to target file.
-W 222 is to set an owner password as 222
-U 111 is to set user password at 111
-P is to set print permission
-C is for setting copy permission.
At the end, hit Enter button .In the created secured PDF file, you can see its information by using the shortcut key Ctrl + D.
See the snapshot below.