copyright vs possessorship

copyright

noun
  • The right by law to be the entity which determines who may publish, copy and distribute a piece of writing, music, picture or other work of authorship. 

  • A violation of copyright law; copyright infringement. 

  • Such an exclusive right as it pertains to one or more specific works. 

verb
  • To obtain or secure a copyright for some literary or other artistic work. 

possessorship

noun
  • The state of possessing something, possession. 

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