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89 lines
3.3 KiB
Markdown
89 lines
3.3 KiB
Markdown
# Letro Android
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Letro Android is a modified version of
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[Element X Android](https://github.com/element-hq/element-x-android),
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the next-generation [Matrix](https://matrix.org/) client developed by
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[Element](https://element.io/) (Element Creations Ltd. / New Vector
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Ltd.). It is distributed by Letro Tech GmbH via the Google Play Store
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under the name "Letro".
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This repository is published as the corresponding source for the
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Letro Android binary, in compliance with the GNU Affero General
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Public License, version 3 (AGPLv3) §6.
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## Relationship to upstream
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- Upstream project: <https://github.com/element-hq/element-x-android>
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- Upstream baseline used by this fork: see
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[`UPSTREAM_VERSION`](UPSTREAM_VERSION)
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- Letro modifications, with dates, serving as the AGPLv3 §5(a)
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modification notice for the work as a whole: see
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[`FORK_DIVERGENCE.md`](FORK_DIVERGENCE.md)
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Upstream technical documentation — build instructions, contributor
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setup, architecture notes — applies unchanged. See the upstream
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[README](https://github.com/element-hq/element-x-android#readme).
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## Status
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This repository tracks the production source for the Letro Android
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app. Issues and bug reports specific to the Letro fork should be
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filed here; issues that reproduce against upstream Element X Android
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belong upstream.
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## Copyright
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```
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Copyright (c) 2026 Letro Tech GmbH <legal@letro.com> -- modifications
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```
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The upstream copyright lines (Element Creations Ltd., New Vector
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Ltd., and the other upstream contributors) are preserved verbatim
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in the source files and in [`LICENSE`](LICENSE), as required by
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AGPLv3. Letro does not claim authorship of upstream code; the parts
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modified by Letro are identified in
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[`FORK_DIVERGENCE.md`](FORK_DIVERGENCE.md).
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## License
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This software is dual-licensed by Element Creations Ltd. ("Element"):
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1. for free under the GNU Affero General Public License, version 3
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or (at your option) any later version (AGPLv3); or
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2. under a paid Element Commercial License agreement between you and
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Element.
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Letro distributes this fork under option (1), AGPLv3. The full
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licence texts are in [`LICENSE`](LICENSE) and
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[`LICENSE-COMMERCIAL`](LICENSE-COMMERCIAL). Letro's own modifications
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are likewise licensed under AGPLv3.
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## Third-party components
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Letro Android bundles third-party components under their own
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licences, including the Matrix Rust SDK (Apache-2.0), Compound Design
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Tokens (AGPLv3), and the further Gradle / Maven dependencies resolved
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in the build. A consolidated attribution list is published at
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[`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md) and mirrored
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in-app under Settings → About → Acknowledgements.
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## Trademarks
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"Matrix" is a trademark of The Matrix.org Foundation C.I.C.
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"Element" and "Element X" are trademarks of Element Creations Ltd. /
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New Vector Ltd.
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"Google", "Google Play" and "Android" are trademarks of Google LLC.
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Letro is **not** affiliated with, endorsed by, or sponsored by The
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Matrix.org Foundation, Element, or Google LLC. References to "Matrix",
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"Element" and the other names above in this repository's source,
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documentation, history and configuration are made solely to identify
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the upstream protocol and the upstream project from which Letro is
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derived, as permitted by nominative fair use.
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## Contact
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Legal / licensing questions: <legal@letro.com>
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Operating entity / imprint: see <https://www.letro.com/imprint> |