joystream/content-directory-schemas/inputs/schemas/10_LicenseSchema.json

{
  "classId": 10,
  "newProperties": [
    {
      "name": "knownLicense",
      "description": "Reference to a known license",
      "required": false,
      "property_type": { "Single": { "Reference": [8, false] } }
    },
    {
      "name": "userDefinedLicense",
      "description": "Reference to user-defined license",
      "required": false,
      "property_type": { "Single": { "Reference": [9, true] } }
    }
  ]
}