42 SERVICES FOR THE DESIGN, DEVELOPMENT, UPDATING, MAINTENANCE AND TESTING OF COMPUTER SOFTWARE IN THE FIELD OF DIGITAL TELEVISION, INTERACTIVE TELEVISION AND PAY-TELEVISION SYSTEMS, IN PARTICULAR FOR SET-TOP BOX AND HEADEND SYSTEMS; DESIGNING, DEVELOPING, TESTING AND PROFILING OF DIGITAL TELEVISION SYSTEMS, INTERACTIVE TELEVISION SYSTEMS, PAY TELEVISION SYSTEMS; TECHNICAL PROJECT STUDIES IN THE FIELDS OF CABLE, SATELLITE AND TERRESTRIAL TELEVISION