feat: add REUSE-compliant license metadata

LICENSES/CC0-1.0.txt

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+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
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+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
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+1. Copyright and Related Rights. A Work made available under CC0 may be
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+vii. other similar, equivalent or corresponding rights throughout the
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+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
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+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
+member of the public at large and to the detriment of Affirmer's heirs and
+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
+person a royalty-free, non transferable, non sublicensable, non exclusive,
+irrevocable and unconditional license to exercise Affirmer's Copyright and
+Related Rights in the Work (i) in all territories worldwide, (ii) for the
+maximum duration provided by applicable law or treaty (including future
+time extensions), (iii) in any current or future medium and for any number
+of copies, and (iv) for any purpose whatsoever, including without
+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
+    statutory or otherwise, including without limitation warranties of
+    title, merchantability, fitness for a particular purpose, non
+    infringement, or the absence of latent or other defects, accuracy, or
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+ c. Affirmer disclaims responsibility for clearing rights of other persons
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+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.

LICENSES/LicenseRef-AllRightsReserved.txt

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+All rights reserved.
+
+No license has been assigned to these files yet. Redistribution, modification,
+or use beyond personal/internal purposes requires explicit permission from the
+respective copyright holder(s).

LICENSES/LicenseRef-Chaostreff-pending.txt

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+The Chaostreff Osnabrück e.V. logo has not yet been assigned a formal
+open license.
+
+Copyright: Chaostreff Osnabrück e.V.
+
+Until a license is officially assigned by Chaostreff Osnabrück e.V., all
+rights are reserved and redistribution requires explicit permission from the
+copyright holder.

LICENSES/LicenseRef-DIDAY-Zoellner-pending.txt

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+The DIDAY event banner has not yet been assigned a formal
+open license.
+
+Copyright: Benjamin Zöllner
+
+Until a license is officially assigned by Benjamin Zöllner, all
+rights are reserved and redistribution requires explicit permission from the
+copyright holder.

LICENSES/OFL-1.1.txt

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+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://openfontlicense.org
+
+
+-----------------------------------------------------------
+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.

README.md

@@ -2,6 +2,22 @@
 
 This repository exists to keep all assets for Chaostreff Osnabrück e.V. and their hackspace Rabbithole in one place. Please use the vectorized versions whenever possible. Some things might be work in progress. When adding new things, please make sure to choose self descriptive names and folders.
 
+## Licensing
+
+License information follows the [REUSE specification](https://reuse.software/). See [`REUSE.toml`](REUSE.toml) for the full details. A summary:
+
+| Path | Copyright | License |
+|------|-----------|---------|
+| `diday/events/` | Nils Israel, Stella Schiffczyk, MultisampledNight | CC0-1.0 AND CC-BY-4.0 |
+| `diday/event-banner/` | Benjamin Zöllner | pending |
+| `chaostreff/`, `chaostalks/`, `rabbithole/`, `osna.social/` | Chaostreff Osnabrück e.V. | pending |
+| `fonts/` | respective authors | OFL-1.1 |
+
+* The DIDAY logo embedded in `diday/events/` is © 2026 Stella Schiffczyk, licensed CC-BY-4.0, from [DI-Day/website](https://codeberg.org/DI-Day/website).
+* The pixeled background in `diday/events/` is © 2025 MultisampledNight, licensed CC-BY-4.0, from [DI-Day/creative-identity](https://codeberg.org/DI-Day/creative-identity).
+* The Chaostreff Osnabrück e.V. logo embedded in `diday/events/` has no open license (all rights reserved). If you reuse or adapt these graphics, you must replace or remove the Chaostreff Osnabrück e.V. logo.
+
+
 ## Chaostreff Osnabrück Logo
 
 The font used in our logo is [DejaVuSans Mono](https://github.com/dejavu-fonts/dejavu-fonts). Because not all systems have this font installed, text should be converted to paths so it renders the same on all machines.

REUSE.toml

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+version = 1
+
+# ── Diday event graphics ──────────────────────────────────────────────────────
+# diday/events/: compositions by Nils Israel (CC0-1.0),
+# incorporating:
+#   - DIDAY logo from https://codeberg.org/DI-Day/website (CC-BY-4.0, Stella Schiffczyk)
+#   - Pixeled background extracted from https://codeberg.org/DI-Day/creative-identity
+#     document/guide/styleguide.pdf (CC-BY-4.0, MultisampledNight)
+# Flyers that include the Chaostreff Osnabrück e.V. logo also carry that
+# logo's copyright; see chaostreff/logo/ annotations and
+# LICENSES/LicenseRef-Chaostreff-pending.txt.
+
+[[annotations]]
+path = "diday/events/**"
+SPDX-FileCopyrightText = [
+    "2026 Nils Israel",
+    "2026 Stella Schiffczyk",
+    "2025 MultisampledNight",
+]
+SPDX-License-Identifier = "CC0-1.0 AND CC-BY-4.0"
+
+[[annotations]]
+path = "diday/event-banner/**"
+SPDX-FileCopyrightText = "2026 Benjamin Zöllner"
+SPDX-License-Identifier = "LicenseRef-DIDAY-Zoellner-pending"
+
+# ── Chaostreff Osnabrück e.V. logo and graphics ───────────────────────────────
+# License not yet assigned.
+
+[[annotations]]
+path = "chaostreff/logo/**"
+SPDX-FileCopyrightText = "Chaostreff Osnabrück e.V."
+SPDX-License-Identifier = "LicenseRef-Chaostreff-pending"
+
+[[annotations]]
+path = ["chaostreff/**", "chaostalks/**", "rabbithole/**", "osna.social/**", "README.md"]
+SPDX-FileCopyrightText = "Chaostreff Osnabrück e.V."
+SPDX-License-Identifier = "LicenseRef-AllRightsReserved"
+
+# ── Fonts ─────────────────────────────────────────────────────────────────────
+
+[[annotations]]
+path = "fonts/AtkinsonHyperlegible/**"
+SPDX-FileCopyrightText = "2019 Braille Institute of America, Inc."
+SPDX-License-Identifier = "OFL-1.1"
+
+[[annotations]]
+path = "fonts/IntelOneMono/**"
+SPDX-FileCopyrightText = "2023-2024 The Intel One Mono Project Authors (https://github.com/intel/intel-one-mono)"
+SPDX-License-Identifier = "OFL-1.1"
+
+[[annotations]]
+path = "fonts/Montserrat/**"
+SPDX-FileCopyrightText = "2024 The Montserrat.Git Project Authors (https://github.com/JulietaUla/Montserrat.git)"
+SPDX-License-Identifier = "OFL-1.1"
+
+[[annotations]]
+path = "fonts/Overpass/**"
+SPDX-FileCopyrightText = "2021 The Overpass Project Authors (https://github.com/RedHatOfficial/Overpass)"
+SPDX-License-Identifier = "OFL-1.1"