Why does that article mention that teletext has only been going for 17 years? I remember seeing teletext buttons on TV's in the 80's and reading about it as early as 1989, knowing that it had been around since the 70's.
Is the commercial entity who just had licensing revoked called "Teletext" the same as the generic term "teletext?"
No, and in that no lies the answer to your first question, too. Teletext Ltd are johnny-come-latelies, taking over the ITV teletext service from Oracle, who had been in the game since the 1970s. The BBC teletext service, called Ceefax, continues, as does the ITV subtitling ("closed caption") service, which in the UK is done using the teletext system.
Peter
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