free speech vs permission

free speech

noun
  • The right to express an opinion in public without being restrained or censored. 

  • Expressions that are or should be allowed in some moral or legal context. 

permission

noun
  • authorisation; consent (especially formal consent from someone in authority) 

  • The act of permitting. 

  • Flags or access control lists pertaining to a file that dictate who can access it, and how. 

verb
  • To grant or obtain authorization for. 

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