Licensing vs Royalties

 License 
 Defines legal permission to: 
 
 
 Use 
 
 
 Modify 
 
 
 Deploy 
 
 
 Commercialize 
 
 
 A license does not automatically imply payment. 
 Royalty 
 A royalty is a payment mechanism attached to licensing. 
 Examples: 
 
 
 Revenue share 
 
 
 API usage fees 
 
 
 Per-client licensing 
 
 Recurring payments