proprietary vs proprietorship

proprietary

noun
  • The rights of a proprietor. 

  • A company doing legitimate business while also serving as a front for espionage. 

  • A monk who had reserved goods and belongings to himself, notwithstanding his renunciation of all at the time of profession. 

  • A proprietor or owner. 

  • A body of proprietors, taken collectively. 

adj
  • Owning something; having ownership. 

  • Created or manufactured exclusively by the owner of intellectual property rights, as with a patent or trade secret. 

  • Of or relating to property or ownership. 

  • Nonstandard and controlled by one particular organization. 

  • Privately owned. 

  • Possessive, jealous, or territorial. 

proprietorship

noun
  • The state of being a proprietor; ownership 

How often have the words proprietary and proprietorship occurred in a corpus of books? (source: Google Ngram Viewer )