It's useful to compare MongoDB's text with another vendor known for restrictive licensing, namely Oracle. Here's the legalese on the MySQL internals documentati

It's useful to compare MongoDB's text with another vendor known for restrictive licensing, namely Oracle. Here's the legalese on the MySQL internals documentation. It has restrictions on dissemination but not actual use. https://dev.mysql.com/doc/internals/en/preface.html https://dev.mysql.com/doc/internals/en/preface.html It does not restrict you from building applications that derive knowledge from MySQL internals documentation.