Notices and open-source licenses
eteyo stands on the work of others. This page is generated from NOTICE.md and the license texts in the repository.
eteyo is an independent project built on other people's work. This file says where that work comes from, what the project's license does not cover, and what eteyo is not.
Origin: bitchat
eteyo is a fork of bitchat, the open-source Bluetooth mesh messenger by permissionlesstech and its contributors. Most of the code in this repository comes from bitchat: the Bluetooth mesh transport, the Noise-based encryption, the Nostr transport, the translations and much of the documentation.
The commits of bitchat's contributors are preserved in this repository's Git history, and the public-domain notices in the source files are kept as they were. The code that comes from bitchat is released into the public domain under the Unlicense.
Not affiliated
eteyo is not the official bitchat app. It is not affiliated with, sponsored by or endorsed by the bitchat project or its contributors. The name "bitchat" belongs to that project; eteyo uses it only to say where it comes from.
Compatibility
eteyo has not changed bitchat's wire protocols: the Bluetooth mesh, the Noise sessions and the Nostr private envelopes are the same. People using eteyo and people using bitchat can see each other nearby and can exchange messages, over Bluetooth and through the same relays.
The list of public Nostr relays that eteyo downloads at runtime comes from a file in bitchat's repository.
Third-party material
The following is not covered by the Unlicense. Each item is under its own license.
- Hug animation (
bitchat/Resources/Effects/HugArms.movandHugArmsReducedMotion.png). Licensed under Creative Commons Attribution 4.0 International. The credit that ships with the files,bitchat/Resources/Effects/HugArms-LICENSE.txt, reads:
HugArms.mov and HugArmsReducedMotion.png Based on Rain Rig (CC) Blender Foundation | studio.blender.org Source: https://studio.blender.org/characters/rain/v3/ Licensed under Creative Commons Attribution 4.0 International: https://creativecommons.org/licenses/by/4.0/ Changes: isolated and re-rigged arms; new screen-hug animation, green ASCII material conversion, transparent-background video and reduced-motion still. This attribution does not imply endorsement by Blender Foundation.
- Arti, the Tor Project's Rust implementation of Tor, in the prebuilt libraries under
localPackages/Arti/Frameworks. Licensed under MIT or Apache-2.0 at your option: seelicenses/arti-MIT.txtandlicenses/Apache-2.0.txt. The libraries also contain the Rust crates pinned inlocalPackages/Arti/Cargo.lock, each under its own permissive license;docs/ARTI-BINARY-PROVENANCE.mdexplains how the libraries are built. - swift-secp256k1 by GigaBitcoin LLC, a Swift Package Manager dependency, licensed under the MIT License: see
licenses/swift-secp256k1-MIT.txt. - libsecp256k1 by Pieter Wuille and contributors, included in swift-secp256k1, licensed under the MIT License: see
licenses/libsecp256k1-MIT.txt. - SwiftCrypto-derived code inside swift-secp256k1, licensed under the Apache License 2.0: see
licenses/Apache-2.0.txtandlicenses/swift-crypto-NOTICE.txt.
Documents inherited from bitchat
WHITEPAPER.md, BRING_THE_NOISE.md, and the files in docs/ whose names do not start with eteyo-, hug-, slap- or testflight come from bitchat. They describe bitchat's design, and where they say "bitchat" they speak about that project. bitchat's privacy and security policies are kept in docs/upstream/ for reference; they do not describe eteyo.
License texts
Apache-2.0.txt
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
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"Contribution" shall mean any work of authorship, including
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(except as stated in this section) patent license to make, have made,
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where such license applies only to those patent claims licensable
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or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
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4. Redistribution. You may reproduce and distribute copies of the
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meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
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Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
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limitations under the License.arti-MIT.txt
Copyright 2019-2025, The Tor Project, Inc. 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.
libsecp256k1-MIT.txt
Copyright (c) 2013 Pieter Wuille 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.
swift-crypto-NOTICE.txt
The SwiftCrypto Project
=======================
Please visit the SwiftCrypto web site for more information:
* https://github.com/apple/swift-crypto
Copyright 2019 The SwiftCrypto Project
The SwiftCrypto Project licenses this file to you under the Apache License,
version 2.0 (the "License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at:
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.
Also, please refer to each LICENSE.<component>.txt file, which is located in
the 'license' directory of the distribution file, for the license terms of the
components that this product depends on.
-------------------------------------------------------------------------------
This product contains test vectors from Google's wycheproof project.
* LICENSE (Apache License 2.0):
* https://github.com/C2SP/wycheproof/blob/31387e2cd596587c859c611027b6a44d2e2b65ff/LICENSE
* HOMEPAGE:
* https://github.com/google/wycheproof
---
This product contains a derivation of various scripts from SwiftNIO.
* LICENSE (Apache License 2.0):
* https://www.apache.org/licenses/LICENSE-2.0
* HOMEPAGE:
* https://github.com/apple/swift-nioswift-secp256k1-MIT.txt
MIT License Copyright (c) 2020 GigaBitcoin LLC 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.