In his motu proprio "Summorum Pontificum" of 7 July 2007, Pope Benedict XVI stated that the 1962 edition of the Roman Missal was never juridically abrogated and that it may be freely used by any priest of the Latin Rite when celebrating Mass "without a congregation". Use of the 1962 edition at Mass with a congregation is allowed, with the permission of the priest in charge of a church, for stable groups attached to this earlier form of the Roman Rite, provided that the priest using it is "qualified to do so and not juridically impeded" (as for instance by suspension). Accordingly, many dioceses schedule regular Masses celebrated using the 1962 edition, which is also used habitually by priests of traditionalist fraternities in full communion with the Holy See such as the Priestly Fraternity of St. Peter, the Institute of Christ the King Sovereign Priest, the Personal Apostolic Administration of Saint John Mary Vianney, the Canons Regular of Saint John Cantius, and the Canons Regular of the Mother of God in Lagrasse, France.