Encryption technology isn't any more "open source" than a master key at a car dealership. Exactly right -- with a car key, you have full access to the 'encryption technology' architecture.
You know what the key looks like, how it works, how it interacts with the lock to open it.
You just don't have the key. Really, it's the exact same system, exact same point.
Am I mistaken, or did you say you're not familiar with software dev?
Open source allows everyone to see exactly how the lock operates, see the lock itself, the blueprints for the keys and how to make the keys for the lock. This is called: "Security without obscurity."
Am I mistaken, did you admit not to have any common sense?