The software used for the forum is called Simple Machines or SMF. I've played with it a bit on my home based web server.
One way to control the permissions of users is to set various groups based on the post count. So there are several groups, some with limited permissions, and the groups have names of various Canon products. As you post more, you move automatically thru different groups, and may gain more permissions. That is set by the forum administrator. For those of us who have been here many years and have tons of posts, they have setup groups with fun names like CR Geek