LegalCredits & licences

Built from open data

Epic Flight Simulator: Slop Edition (Toronto Fly-Over Demo) is built from open data and permissively licensed tools. This page lists each third-party source, its licence and the attribution that licence requires.

1. Data in the game

The world is generated by the game's open-data pipeline (Tools/pipeline) into these files:

• Content/FlightData/world.bin: terrain grid, building footprints and heights, trees and elevated roads.
• Content/FlightData/world.json: runways, landmarks, spawn points, tour gates and attribution.
• Data/Textures/T_Ground.png (imported as /Game/EFS/Textures/T_Ground): the stylised ground map and night-light mask, rendered from the same data.

1.1 OpenStreetMap: Open Database License (ODbL) 1.0

© OpenStreetMap contributors

Contains information from OpenStreetMap, which is made available here under the Open Database License (ODbL) 1.0. openstreetmap.org/copyright

• Licence: opendatacommons.org/licenses/odbl/1-0/
• Obtained in one of two ways: from the Overpass API (overpass-api.de and the community mirrors maps.mail.ru, overpass.private.coffee and overpass.kumi.systems); or from the BBBike.org "Toronto" extract, a regional cut of the OpenStreetMap database that BBBike.org redistributes under the same ODbL 1.0 terms. The shipped world.json records which source a build used (stats.osmSource). When the extract is used, the line "OpenStreetMap extract: BBBike.org Toronto (© OpenStreetMap contributors, ODbL 1.0)" is added to its attribution.
• Used for: water bodies and the Lake Ontario shoreline, parks, forests and land use, roads, railways, runways and taxiways, bridges and elevated roads, trees, building tags and landmark names.

Derivative database and share-alike. world.bin and world.json combine OpenStreetMap data with the other sources below. They are therefore a Derivative Database of OpenStreetMap (ODbL §4.4). The rendered city, the ground texture, screenshots (including those on this website) and the game itself are Produced Works (ODbL §4.3).

In line with ODbL §4.4 and §4.6:

• The Derivative Database (Content/FlightData/world.bin and world.json) is offered under the Open Database License 1.0. It is distributed in machine-readable form with the project source.
• The full method used to create it is distributed with the project under the MIT License: the pipeline source code in Tools/pipeline and the file format specification in Docs/CONTRACT.md. Anyone can regenerate or change the database.
• No technical measures restrict access to it. The format is documented and unencrypted. In a packaged build it is stored in the game's pak file, and the same files are in the project source.

If you only have a packaged build and want the derivative database, get it from the project source (Content/FlightData/) or regenerate it with python Tools/pipeline/build_world.py.

1.2 City of Toronto 3D Massing: Open Government Licence – Toronto

Contains information licensed under the Open Government Licence – Toronto.

• Dataset: "3D Massing", City of Toronto Open Data Portal, 2025 shapefile release (WGS84).
• Licence: open.toronto.ca/open-data-license/
• Used for: building footprints and heights. The data was simplified, merged with OpenStreetMap attributes and re-encoded. It is not an official City of Toronto product, and its use does not imply endorsement by the City of Toronto.

1.3 Elevation: Mapzen / AWS Terrain Tiles (Tilezen "Terrarium")

• Dataset: Terrain Tiles on AWS, originally compiled by Mapzen and now maintained by the Linux Foundation's Tilezen project.
• The tiles combine several elevation sources. These are the attributions required by the Tilezen attribution list for the sources that cover this demo's region (Toronto and the nearby shore of Lake Ontario):
  • Canada: "Canada terrain data contains information licensed under the Open Government Licence – Canada." (Canadian Digital Elevation Model, CDEM, © Natural Resources Canada; Open Government Licence – Canada)
  • Global and United States: "United States 3DEP (formerly NED) and global GMTED2010 and SRTM terrain data courtesy of the U.S. Geological Survey." (SRTM, GMTED2010 and 3DEP are public domain.)
  • Global: "Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric Administration." (ETOPO1: DOC/NOAA/NESDIS/NCEI, public domain.)
  • Mapzen: compiled and hosted as Mapzen Terrain Tiles.
• Used for: the 30 m terrain grid. Lake areas were flattened below the Lake Ontario level and the shorelines were reshaped.

1.4 Combined attribution (as stored in world.json and shown in game)

Map data © OpenStreetMap contributors, ODbL 1.0 (openstreetmap.org/copyright) · Buildings: City of Toronto 3D Massing (2025). Contains information licensed under the Open Government Licence – Toronto · Elevation: Mapzen / AWS Terrain Tiles (Terrarium) incl. SRTM (NASA), GMTED2010 (USGS), ETOPO1 (NOAA) and the Canadian Digital Elevation Model © Natural Resources Canada, Open Government Licence – Canada · OpenStreetMap extract: BBBike.org Toronto (© OpenStreetMap contributors, ODbL 1.0)

2. Unreal Engine

This game is built with Unreal Engine 5.7 by Epic Games, Inc., under the Unreal Engine End User License Agreement.

Unreal Engine is source-available. It is not open source in the OSI sense. Its EULA allows commercial use. This free-to-play demo owes no royalties, because royalties apply only to a product's gross revenue above the threshold set in the EULA.

Unreal® is a trademark or registered trademark of Epic Games, Inc. in the United States of America and elsewhere.

Unreal® Engine, Copyright 1998–2026, Epic Games, Inc. All rights reserved.

Engine content used at runtime is distributed as part of Unreal Engine under its own terms: the basic shapes, the sky and volumetric-cloud materials, and the engine fonts used by the HUD (Roboto, Apache License 2.0). The third-party components bundled with the engine are listed in the engine installation.

3. Build-time tools (not shipped in the game)

These are used only to build the data or the game. None of them is distributed with it.

4. Original work

All procedural geometry (buildings, CN Tower, aircraft, trees, roads), shaders, synthesised sounds and HUD graphics are generated by the game's own code and are covered by the MIT License. No third-party art assets, models, sounds or fonts are included apart from those listed above.

This website's screenshots are captures of the game and contain the data credited above. The website is set in Barlow, Barlow Condensed and JetBrains Mono, served by Google Fonts under the SIL Open Font License 1.1.

MIT License

MIT License

Copyright (c) 2026 Epic Flight Simulator: Slop Edition contributors

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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This license covers the project's own source code, scripts, configuration and
documentation. It does NOT cover:
  * Unreal Engine, which is licensed separately under the Unreal Engine EULA;
  * the map, building and elevation data in Content/FlightData and
    Data/Textures, which are derived from third-party open data under the
    licences listed above (ODbL 1.0, Open Government Licence - Toronto,
    Open Government Licence - Canada, public domain).