So, if this is taken to mean ownership or control of cryptocurrency wallet, what does that imply? What defines ownership? Access? If someone holds a key to a h

So, if this is taken to mean ownership or control of cryptocurrency wallet, what does that imply? What defines ownership? Access? If someone holds a key to a house that doesn't mean they own the house. What defines control? If a key is destroyed, and no one else owns that key, is is control lost? What if the key is lost? Is control lost until the key is recovered?