COMPUTER HARDWARE AND SOFTWARE SYSTEMS FOR CREATING CUSTOM AUDIO-VISUAL WORKS FROM A LIBRARY OF PRE-EXISTING AUDIO-VISUAL WORKS AND DELIVERING THE SAME OVER THE INTERNET OR VIA VIDEOTAPES OR CD-ROM'S OR DVD'S; AND PRODUCING AND DISTRIBUTING CUSTOM AUDIO-VISUAL WORKS FROM A LIBRARY OF PRE-EXISTING AUDIO-VISUAL WORKS