license vs servitude

license

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. 

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. 

servitude

noun
  • The state of being a slave; slavery; being forced to work for others or do their bidding without one's consent or against one's will, either in perpetuity or for a period of time over which one has little or no control. 

  • A qualified beneficial interest severed or fragmented from the ownership of an inferior property and attached to a superior property or to some person other than the owner; the most common form is an easement. 

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