RECOVERY OF COMPUTER DATA; PROVIDING ELECTRONIC VERIFICATION OF ON-LINE ORDERS OF DIGITAL CONTENT AND GENERATING ELECTRONIC PERMISSION CODES WHICH THEN ALLOW USERS TO ACCESS SAID DIGITAL CONTENT; PROVIDING CUSTOMIZED ON-LINE WEB PAGES FEATURING USER-DEFINED INFORMATION, WHICH INCLUDES SEARCH ENGINES AND ONLINE WEB LINKS TO OTHER WEB SITES; MONITORING THE COMPUTER SYSTEMS OF OTHERS FOR TECHNICAL PURPOSES AND PROVIDING BACK-UP COMPUTER PROGRAMS AND FACILITIES; MAINTENANCE OF COMPUTER SOFTWARE; ...