Any organization of the faithful must have a “rule”: a set of guidelines for how the organization will conduct itself. The CCR is, of course, no different. We've divided this information out into some prominent parts; however, you can view rule itself for the full story.
The CCR is a private association of faithful; as such, it has a “rule” only in a modified sense. Being a private association of faithful, its rule is not recognized by the official authority of the Church, and as such it cannot bind under pain of sin, the way the rule of a proper religious order would bind its members. Rather, the rule consists of two things:
Christus vincit! Christus regnat! Christus imperat!