let vs license

let

verb
  • To allow to be or do without interference; to not disturb or meddle with; to leave (someone or something) alone. 

  • To give, grant, or assign, as a work, privilege, or contract; often with out. 

  • Used to introduce a first or third person imperative verb construction. 

  • To cause (+ bare infinitive). 

  • To allow the release of (a fluid). 

  • To allow possession of (a property etc.) in exchange for rent. 

  • To allow to, not to prevent (+ infinitive, but usually without to). 

noun
  • The hindrance caused by the net during serve, only if the ball falls legally. 

  • An obstacle or hindrance. 

  • The allowing of possession of a property etc. in exchange for rent. 

license

verb
  • To give permission or freedom to; accept. 

  • To authorize officially. 

  • To acquire authorization to use, usually in exchange for compensation. 

  • To permit (as grammatically correct). 

  • To give formal authorization to use. 

noun
  • The legal terms under which a person is allowed to use a product, especially software. 

  • A legal document giving official permission to do something; a permit. 

  • Freedom to deviate deliberately from normally applicable rules or practices (especially in behaviour or speech). 

  • Excessive freedom; lack of due restraint. 

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