Abstract: The present invention provides recombinant viral segments comprising an artificial intron, DNA constructs encoding these viral segments, and recombinant viruses comprising these viral segments. Also provided are methods of making and using the recombinant viruses described herein.

Abstract: A method of classifying video data representing activity within a space to be monitored. A method comprises storing video data obtained from a camera configured to monitor the space. Sensor data indicative of a condition occurring within the space is obtained, and a plurality of program elements are defined within the video data. Each program element has an associated classification code, and each classification code is selected using the sensor data.

Abstract: A method for presenting a plurality of programme elements to a user. Each programme element has an associated classification code, and the method comprises presenting a user interface operable to receive user selection data indicating one of said plurality of programme elements, and to cause display of said indicated programme element. One of said programme elements is presented, the classification code associated with said presented programme element is screened to determine if said classification code satisfies a predetermined criteria and operation of said user interface is disabled if but only if said predetermined criteria is satisfied.