But, if I were paying the $50,000 a year that the commercial systems charge then it is possible, or even likely, that the vendors would provide a patch for my system.
A reasonable person would certainly expect that.
I don't want to name specific incidents or specific products, but I can assure you that that's not always the case.
The Moodle team (including Martin, all the other developers, and all the people who post on this forum) is much more responsive and helpful than any commercial CMS vendor with which I am familiar.
Teaching with Moodle
Summative testing and security
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