Software for securing private, proprietary and confidential data and information on enterprise networks by monitoring and classifying data in the network and blocking or restricting the transmission of selected data, including data transmitted via the internet, electronic mail, facsimile and mail; computer software for network access control; computer software for network intrusion detection and control, data encryption and data authentication, and network privacy protection; computer software for authentication and authorization of users; computer software for the creation of digital keys and certificates for user authentication; computer software for monitoring and enforcing compliance with regulatory policies and laws for electronic communications and data repositories; computer software for monitoring and enforcing compliance with enterprise data security policies and protocols; computer software for protecting copyrighted or protected information by monitoring and blocking the transmission of such information and documents to unauthorized recipients; computer CPUs and communications servers pre-loaded or compatible with the aforementioned software