Exo 2 / 400
{
  "copyright": {
    "en": "Copyright 2013 The Exo 2 Project Authors (https://github.com/googlefonts/Exo-2.0)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}

Exo 2 / 600
{
  "copyright": {
    "en": "Copyright 2013 The Exo 2 Project Authors (https://github.com/googlefonts/Exo-2.0)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}

Exo 2 / 700
{
  "copyright": {
    "en": "Copyright 2013 The Exo 2 Project Authors (https://github.com/googlefonts/Exo-2.0)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}