He may be right. The law about copyright notices changed on 1978 Jan 1 [1], so if Wirth's compiler predated the change to US law... [1] https://en.wikipedia.or

He may be right. The law about copyright notices changed on 1978 Jan 1 [1], so if Wirth's compiler predated the change to US law... [1] https://en.wikipedia.org/wiki/Copyright_Act_of_1976 https://en.wikipedia.org/wiki/Copyright_Act_of_1976