Are you a developer? Do you want to add "PDF Encryption", "PDF Decryption", "Set the permission of the user such as printing, modifying etc" feature to your application?Now, you can try PDF Security ActiveX DLL, with a few function calls, it helps you decrypt & encrypt pdf in your Win programs or Web applications.PDF Security ActiveX DLL was intended to Protect Adobe Acrobat PDF files, that comes with "owner" and "user" password set, preventing the file from editing (changing), printing, selecting text and graphics (and copying them into the Clipboard), or adding/changing annotations and form fields.All editions of Adobe Acrobat (including 5.x, 6.x, 7.x, 8.x, 9.x which tools 40-bit,128-bit RC4 & AES, 256-bit AES encryption) are allowed by PDF Security ActiveX DLL.It is a standalone component and does not depend on Adobe Acrobat, or even Acrobat Reader.Key Features: *Support Windows NT4, Windows 2000(Server & Professional), Windows XP(Home & Professional), Windows 2003. *Support Windows VISTA, Windows 7 (32-bit), Windows 2008 R2 (32-bit). *Password protect opening of the document. *Password protection for PDF files with 40-bit or 128-bit or 256-bit encryption. *Support add user password and owner password. *Support add printing, copying and changing permissions to an encrypted PDF file. *Remove the security settings from your encrypted PDF file is instant. *Support Adobe Standard 40-bit Encryption, Adobe Advanced 128-bit Encryption and AES Encryption. *Decrypt protected Adobe Acrobat PDF files, removing restrictions on printing, editing, copying. *Support detect whether the PDF file is encrypted. *Support PDF 1.8 format (Acrobat 9.0 application). *Royalty free, Use PDF Encrypt ActiveX DLL in your applications without needing to pay any royalty fees for distribution. *No limits on number of applications.