This is from the Magnetic Video laserdisc of "The Black Stallion", copyrighted 1981. The cover and disc label say "Magnetic Video", but it includes this intro instead of the older Magnetic Video one, so it must have been produced right when the company changed its name (it was started as an independent company in 1978 since the major studios weren't sure there'd be much of a market for movies on home video to put them out themselves, later it was bought by 20th Century Fox, whose movies already made up the majority of their catalog.) After the name change, if a movie was from Fox there'd be no intro at all (at least on tape, laserdiscs still had the LaserVision intro but that was it), but if it was a UA movie it would have this intro, which sounds like a TV sponsor announcement.

Fox had a deal to distribute movies from United Artists up til 1983, after that they were put out by MGM.
A few titles such as "Wargames" came out on laserdisc on both the Fox and MGM labels the same year; several United Artists movies also came out twice on the short-lived CED videodisc format- once from RCA's own label and again from CBS/Fox Video.

United Artists films most often have their intros butchered- the one here is replaced by one generated on video. They seem to like to include the most current intro no matter how old the movie is- Most of their movies on DVD, put out by MGM, have the most recent United Artists intro in front of them. And yes, this does annoy me. (less info)