Passport Ranker — attribution, data licensing, and disclaimers
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This project has two licensing layers:

  • Source code  — MIT License (see LICENSE).
  • Dataset      — the compiled file web/data/passports.json is a database
                   licensed under the Open Database License (ODbL) v1.0
                   (https://opendatacommons.org/licenses/odbl/1-0/), because it
                   incorporates substantial data from mledoze/countries, which
                   is ODbL. Per ODbL, the *database* is share-alike; the
                   *individual contents* retain their upstream licenses (listed
                   below). Rankings produced and displayed by the app are an
                   ODbL "Produced Work" and are not themselves ODbL-encumbered.

If you redistribute the dataset, keep it under ODbL and preserve the attribution
below. If you redistribute the code, keep the MIT notice.


Data sources & their licenses
-----------------------------

1. Visa requirements — ilyankou/passport-index-dataset
   https://github.com/ilyankou/passport-index-dataset
   License: MIT. Compiled from Wikipedia "Visa requirements for X citizens"
   pages. Required MIT notice reproduced below.

2. Country statistics — CIA World Factbook, via factbook/factbook.json
   https://github.com/factbook/factbook.json
   License: Public Domain (U.S. Government work; the mirror dedicates its data
   and scripts to the public domain). No restrictions.

3. Geography (latitude/longitude, official languages, land borders) —
   mledoze/countries
   https://github.com/mledoze/countries
   License: Open Database License (ODbL) v1.0. Attribution + share-alike.
   This is the source that makes the compiled dataset ODbL.

4. Human Development Index — UNDP Human Development Report
   https://hdr.undp.org
   Free to use with attribution to the UNDP Human Development Report Office.

5. Price level index (ICP / PA.NUS.GDP.PLI) — The World Bank
   https://data.worldbank.org/indicator/PA.NUS.GDP.PLI
   License: CC BY 4.0. Attribution required.

6. Happiness, average temperature, homicide rate, PM2.5, internet use, tourist
   arrivals, precipitation — Our World in Data (OWID)
   https://ourworldindata.org
   OWID's own compiled/processed data is CC BY 4.0 (attribution required).
   Some underlying series carry their producers' terms and attributions, in
   particular:
     • Happiness — World Happiness Report, based on Gallup World Poll data.
     • Tourist arrivals — UN World Tourism Organization (UNWTO) / World Bank.
     • Homicide rate — UN Office on Drugs and Crime (UNODC).
     • Air quality (PM2.5) — WHO / van Donkelaar et al.
     • Temperature & precipitation — Copernicus / World Bank climate data.
   Only published national aggregates (facts) are used, with attribution.


Trademark / non-affiliation
---------------------------
This project is not affiliated with, endorsed by, or sponsored by Henley &
Partners, Arton Capital, or any passport index. "Henley Passport Index" and
"Passport Index" are trademarks of their respective owners. Their names appear
only in source comments and internal tooling to accurately describe which
public methodology a metric reproduces (nominative fair use); no ranking data
of theirs is redistributed beyond a small factual sample used for verification.


Disclaimer
----------
Informational use only. Visa policies change frequently, and this dataset is an
approximate snapshot compiled from open, community-maintained sources. It is NOT
legal or travel advice. Verify entry requirements with official government
sources before making any travel or immigration decision. The data is provided
"as is", without warranty of any kind.


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Required upstream notice — ilyankou/passport-index-dataset (MIT):

  MIT License

  Copyright (c) 2019 Ilya Ilyankou

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
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