copyright vs registered trademark

copyright

noun
  • A violation of copyright law; copyright infringement. 

  • 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. 

  • 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. 

registered trademark

noun
  • A trademark that has been officially registered with the government by its owner. Indicated by the symbol ®. 

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