Petra Petra

Licences

Open-source software, fonts and data used by Petra

Generated from the project’s dependencies, 7 November 2026

Rights holder and licence of the service

Petra, including its source code, brand, design and documentation, is protected by copyright and related rights. The rights are held by •••, Barcelona, Spain (the “Rights Holder”). The service is operated by •••, Amsterdam, The Netherlands, on the basis of a licence granted by the Rights Holder for an indefinite period and on an exclusive basis. The terms of that licence relationship are confidential.

Nothing on this page or in the Petra apps transfers ownership of the code, brand or content to the operator or to users. Open-source components remain under their own licences listed below.

Software packages

Petra is built with the following open-source packages (direct dependencies). Each is used under the licence named here; the full licence texts are included in the packages. Further packages they depend on are covered by their own licences and are available on request at [email protected].

Fonts: Apfel Grotezk

Apfel Grotezk, designed by Luigi Gorlero, © 2019–2023 Collletttivo (https://www.collletttivo.it/). Used under the SIL Open Font License 1.1. The licence text below is the original (English) and is the legally binding version.

Copyright © 2023, Collletttivo (https://www.collletttivo.it/ | [email protected])

This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is copied below, and is also available with a FAQ at: https://scripts.sil.org/OFL

SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007

PREAMBLE

The goals of the Open Font License (OFL) are to stimulate worldwide development of collaborative font projects, to support the font creation efforts of academic and linguistic communities, and to provide a free and open framework in which fonts may be shared and improved in partnership with others.

The OFL allows the licensed fonts to be used, studied, modified and redistributed freely as long as they are not sold by themselves. The fonts, including any derivative works, can be bundled, embedded, redistributed and/or sold with any software provided that any reserved names are not used by derivative works. The fonts and derivatives, however, cannot be released under any other type of license. The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives.

DEFINITIONS

"Font Software" refers to the set of files released by the Copyright Holder(s) under this license and clearly marked as such. This may include source files, build scripts and documentation.

"Reserved Font Name" refers to any names specified as such after the copyright statement(s).

"Original Version" refers to the collection of Font Software components as distributed by the Copyright Holder(s).

"Modified Version" refers to any derivative made by adding to, deleting, or substituting -- in part or in whole -- any of the components of the Original Version, by changing formats or by porting the Font Software to a new environment.

"Author" refers to any designer, engineer, programmer, technical writer or other person who contributed to the Font Software.

PERMISSION & CONDITIONS

Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and unmodified copies of the Font Software, subject to the following conditions:

1) Neither the Font Software nor any of its individual components, in Original or Modified Versions, may be sold by itself.

2) Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license. These can be included either as stand-alone text files, human-readable headers or in the appropriate machine-readable metadata fields within text or binary files as long as those fields can be easily viewed by the user.

3) No Modified Version of the Font Software may use the Reserved Font Name(s) unless explicit written permission is granted by the corresponding Copyright Holder. This restriction only applies to the primary font name as presented to the users.

4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font Software shall not be used to promote, endorse or advertise any Modified Version, except to acknowledge the contribution(s) of the Copyright Holder(s) and the Author(s) or with their explicit written permission.

5) The Font Software, modified or unmodified, in part or in whole, must be distributed entirely under this license, and must not be distributed under any other license. The requirement for fonts to remain under this license does not apply to any document created using the Font Software.

TERMINATION

This license becomes null and void if any of the above conditions are not met.

DISCLAIMER

THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.

Fonts: JetBrains Mono

JetBrains Mono, © 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono). Used under the SIL Open Font License 1.1 (text above applies, with this copyright line).

Icons

Interface icons: Lucide (https://lucide.dev), ISC licence.

Data

The list of top-level domains used to recognise links comes from the IANA Root Zone Database (https://www.iana.org/domains/root/db).

Maps

Petra does not show maps yet. If maps or location sharing are added, the required map data credits (for example “© OpenStreetMap contributors”) will be listed here.

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