no strings attached vs restricted

no strings attached

adj
  • Characterized by an absence of conditions or obligations. 

adv
  • Without conditions or obligations; without a catch. 

restricted

adj
  • Available only to certain authorized groups of people. 

  • Only available to customers who do not belong to racial, ethnic or religious minorities. 

  • Limited within bounds. 

How often have the words no strings attached and restricted occurred in a corpus of books? (source: Google Ngram Viewer )