Playfair / 400
{
  "copyright": {
    "en": "Copyright 2005 The Playfair Project Authors (https://github.com/clauseggers/Playfair)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}

Playfair / 600
{
  "copyright": {
    "en": "Copyright 2005 The Playfair Project Authors (https://github.com/clauseggers/Playfair)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}

Playfair / 700
{
  "copyright": {
    "en": "Copyright 2005 The Playfair Project Authors (https://github.com/clauseggers/Playfair)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}