Readex Pro / 400
{
  "copyright": {
    "en": "Copyright 2019 The Readex Pro Project Authors (https://github.com/ThomasJockin/readexpro)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}

Readex Pro / 600
{
  "copyright": {
    "en": "Copyright 2019 The Readex Pro Project Authors (https://github.com/ThomasJockin/readexpro)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}

Readex Pro / 700
{
  "copyright": {
    "en": "Copyright 2019 The Readex Pro Project Authors (https://github.com/ThomasJockin/readexpro)"
  },
  "licenseURL": {
    "en": "https://openfontlicense.org"
  }
}