Abstract: Roughly described, a server, accessible by a requesting device via a network, includes a database storing a plurality of composite video assets each having pictures to be displayed in sequence. Each of the pictures in the asset has first and second rectangular regions, which are adjacent to each other along a common edge. A primary movie is carried in the first rectangular region while the second rectangular region carries a plurality of temporally-arranged advertising images. The advertising images do not overlap, intrude on or distort the primary movie, but rather expand the canvas on which both image sequences appear. The images in the first and second rectangular regions are spatially composited together in each picture as single, unitary pictures prior to streaming transmission toward the user's device, so that no second concurrent stream is required. Several methods to develop the composite assets are described.