Live-ball foul treated as dead-ball foul

[#92]

When a foul(s) occurs after a touchdown and before the ball is ready for
play on the try or there was a live-ball foul treated as a dead-ball foul on the
touchdown play, enforcement is on the try or the succeeding kickoff, at the
option of the offended team. If there is no kickoff, the accepted penalty is
enforced on the try (A.R. 3-2-3-V).

What exactly is "a live-ball foul treated as a dead-ball foul"? Can't seem to find any other spot in the Rules where that phrase is used...

[Kalle]

Nowadays these are pretty rare, as USC's are live-ball fouls. Some of such fouls are visiting team wearing a colored jersey on kickoff, contacting an official, and sideline interference.

You can find these by looking for "Administer as a dead-ball foul" text in the rule book.