Authentication, issuance and validation of digital certificates; Computer programming; Computer security services in the nature of administering digital certificates; Computer security services in the nature of providing authentication, issuance, validation and revocation of digital certificates; Computer security services, namely, restricting unauthorized access to computer networks; Computer system analysis; Computer system design; Computer virus protection services; Consulting services in the fields of selection, implementation and use of computer hardware and software systems for others; Data encryption services for providing security and anonymity for electronically transmitted credit card transactions; Design, development, and implementation of software for authenticating digital signatures; Design, installation, updating and maintenance of computer software; Duplication of computer programs; Providing electronic verification of on-line orders of digital content and generating electronic permission codes which then allow users to access said digital content; Rental of computer software; User authentication services using technology for e-commerce transactions; Technological planning and consulting services in the field of computer hardware systems