Adjective
Of or pertaining to ownership; proprietary; as, proprietorial rights.
Source: Webster's dictionaryI get a little nauseated, perhaps, when I hear the phrase 'freedom of the press' used as freely as it is, knowing that a large part of our proprietorial press is not free at all. Harold Wilson
I don't feel proprietorial about the problems of philosophy. History has taught us that many philosophical issues can grow up, leave home and live elsewhere. Julian Baggini