set_license
Description:
Sets the license property of the 
      YouTubeQuery to the new license value, license.
Set license to null to unset the property in the query URI.
Parameters:
| this | |
| license | 
           a new license value, or   | 
      
Sets the license property of the 
      YouTubeQuery to the new license value, license.
Set license to null to unset the property in the query URI.
| this | |
| license | 
           a new license value, or   |