@schachernp If you put something in Commons, only you (that is the person who put it in commons) will be able to make any changes my providing a version update. Anyone accessing the Course from commons can not change the original content. You can put a page, a file, a document, a quiz, a module, or even a whole course in Commons.
https://community.canvaslms.com/t5/Commons/How-do-I-update-a-resource-I-previously-shared-to-Commons...
Once updates are done on commons, the teacher can go into commonms, lick on the update tab at the top and literally one click update their course. Whatever was changed/or added will then import into the course they want it to go to.
They will still be able to modify if on their side to fit their needs. HOWEVER, when you update from commons something that has been updated, any changes you made will overwritten, at least to my knowledge and someone could correct me if I am wrong.
https://community.canvaslms.com/t5/Commons/How-do-I-view-updates-to-resources-I-previously-imported-...
If I were in your shoes, here is what I would do. Create stand alone sandboxes for each course and invite the teachers (with teacher role) to be part of those sandboxes. Then they can import or copy the new modules themselves. I know I share a sandbox with 10 other teachers in my district and we all add stuff there and "steal" from each other.
Good luck!
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