Can you provide a description of roles and rights in OpenClass?

I have not been able to locate a description of rights for each user type. Can someone point me to it or perhaps reply to this with the various priveledges.

For example, we had a Master Teacher create a course. We would like others to be able to "teach" it, but not have the permissions to edit the content. However, they should still be able to interact with students as an instructor. I assume this would be the Teaching Assistant role, but I cannot seem to find the rights spelled out anywhere.
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