“Open Source” is a proper noun defined by OSI, not to be confused with the general phrase “open source” which predates OSI. You use both interchangeably in your

“Open Source” is a proper noun defined by OSI, not to be confused with the general phrase “open source” which predates OSI. You use both interchangeably in your reply, which is invalid (apples/oranges). Please be more specific: do you mean the OSI definition or the pre-OSI colloquialism?