The chips as far as I know were never cloned, so I would say UTsource are genuine. It is a specialised IC and were used by cctv companies and video equipment manufacturers. In the UK they are still being used in the Amateur radio fraternity. It is a long time since EOL, but they are still very useful.

If you go here http://dunstabledownsradioclub.org and choose TV Streams, GB3TZ in beacon mode (when not being used) the display is done using the STV chip, controlled by a Pic micro - (done in assembler, not by me) , the Pic also controls the repeater logic.

My involvement in these chips - way back in 2003ish was to insert time overlay in cctv systems which did not have their own OSD, and using MSF or GPS to provide accurate time.