is#software_license
  supertype:  license__permit  a legal document giving official permission to do something
  subtype:  free_software/freeware/shareware_licence
     subtype:  freeware_license
     subtype:  shareware_license__sharewarelicense
     subtype:  GNU_general_public_license
     subtype:  GNU_lesser_general_public_license
  subtype:  proprietary_software_license
  subtype:  BSD_license
  subtype:  bundled_with_Mac_OS_X_license
  subtype:  bundled_with_Microsoft_Windows_license

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