The first is the legal concept of ownership, which applies to collection objects and to The second is specific to StampData, and refers to control of data, including its [[visibility>album\s, and simply means physical possession in the usual way.

The second is specific to StampData, and refers to control of data, including its [[visibility to site visitors.

The two concepts overlap because we defer to the real-life owner when recording data about a real-life object; you have the stamp in your hand (ok, tongs), you will know whether the Collection objects must always be owned (although the owner might be unknown, or not be a StampData member). You may relinquish ownership of [[image>image\ you uploaded is of that stamp or not.

Collection objects must always be owned (although the owner might be unknown, or not be a StampData member). You may relinquish ownership of [[images and notes, thereby allowing others to manipulate them.