possession vs proprietary rights

possession

noun
  • The condition or affliction of being possessed by a demon or other supernatural entity. 

  • Control of the ball; the opportunity to be on the offensive. 

  • A disposal of the ball during a game, i.e. a kick or a handball. 

  • Something that is owned. 

  • Control or occupancy of something for which one does not necessarily have private property rights. 

  • Ownership; taking, holding, keeping something as one's own. 

  • A territory under the rule of another country. 

  • The condition of being under the control of strong emotion or madness. 

  • A syntactic relationship between two nouns or nominals that may be used to indicate ownership. 

proprietary rights

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