copyread vs redact

copyread

verb
  • To read text (of a newspaper etc.) and edit it to correct mistakes. 

redact

verb
  • To reduce to form, as literary matter; to digest and put in shape (matter for publication); to edit. 

  • To black out legally protected sections of text in a document provided to opposing counsel, typically as part of the discovery process. 

  • To draw up or frame a decree, statement, etc. 

  • To censor, to black out or remove parts of a document while leaving the remainder. 

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