---
title: "Licences – Relyo"
description: "Relyo is licensed under 0BSD. Open source components used and their licences."
lang: en
canonical: https://relyo.de/en/lizenzen
---

# Licences

_This is a translation for convenience. The [German version](/lizenzen) is authoritative._

## Relyo

Relyo is open source under the **0BSD** licence: any use, copying, modification and distribution is permitted, with or without fee, with no requirement to keep a copyright notice. The software is provided without warranty.

## Open source components used

Relyo is built on open source software. What relyo.de delivers to browsers and apps contains the following components; their licence texts and copyright notices are included in full.

| Part                              | Main components                                         | Licences                  | Full list                                                                                                                                          |
| --------------------------------- | ------------------------------------------------------- | ------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| Web SDK (`relyo.js`, `relyo.mjs`) | rrweb (screen mirroring)                                | MIT, ISC, BSD-3-Clause    | [/sdk/THIRD_PARTY_LICENSES.txt](/sdk/THIRD_PARTY_LICENSES.txt)                                                                                     |
| Console for supporters            | React, rrweb                                            | MIT, ISC, BSD-3-Clause    | [/third-party-licenses.txt](/third-party-licenses.txt)                                                                                             |
| Flutter SDK (`relyo_flutter`)     | Flutter, package:web                                    | BSD-3-Clause              | shown automatically in the app's licence dialog (`showLicensePage`)                                                                                |
| This website                      | Fonts Bricolage Grotesque, IBM Plex Sans, IBM Plex Mono | SIL Open Font License 1.1 | [Bricolage Grotesque](/fonts/OFL-BricolageGrotesque.txt), [IBM Plex Sans](/fonts/OFL-IBMPlexSans.txt), [IBM Plex Mono](/fonts/OFL-IBMPlexMono.txt) |

The lists are generated automatically on every build from the dependencies actually shipped.

## Server

The relyo.de server uses, among others, Node.js, Fastify, ws, better-sqlite3, jose, zod, pino and nodemailer (MIT, ISC, BSD, Blue Oak, MIT-0) and Cloudflare Tunnel (`cloudflared`, Apache-2.0). These components run only on the server and are not distributed.

The website and documentation are generated with Astro (MIT); none of its code runs in the browser.