Pressbooks SSO SAML plugin

I’m working on another Wordpress based project…

I was curious about the Pressbooks SAML SSO plugin. I’m assuming that it is a fork of another SSO plugin that was modified for Pressbooks needs.

Is that the case? What project is Pressbooks SSO plugin forked from?

I’ve been messing with a Wordpress site connected to our ADFS using the MiniOrange SSO plugin, and the creators kind of intentionally kneecap the plugin to try to make you upgrade to the premium version. If there was another good plugin to look into I’d appreciate the point in the right direction.

Thanks for the help!