Available only as a purchasable software application, pdfCipher is a command line utility that is intended to help users secure their PDF documents by implementing encryption. Supported in various Windows systems such as Windows 95, 98, 2000, NT, and XP versions, this utility has been designed and developed by ITEKSOFT. Using this tool, you can modify the security settings of PDF documents in a batch. It offers support for, both, 40 bit and 128 bit mode. Designed and developed using C++, this tool does not require Acrobat or other applications for implementation. The tool claims to be faster than those created using Perl or other programming languages.