Do-jime is one of the four forbidden techniques, Kinshi-waza. Do-jime is also a prohibited technique in Judo competitions, and is considered a 'slight infringement' according to IJF rules, Section 27: Prohibited acts and penalties, article 21.
The reference highlights that Do-jime, a technique within the category of Kinshi-waza, is both forbidden and considered a minor infraction in Judo competitions as per IJF rules.