# OnAirScreen Source-Available License Version 1.0 — September 2026 Copyright (c) 2012-2026 Sascha Ludwig, astrastudio.de All rights reserved. ## 1. Definitions For the purposes of this License: **"Software"** means the OnAirScreen software and the portions of the OnAirScreen source code to which this License is explicitly applied. **"Source Code"** means the human-readable source code of the Software, including source files, scripts, configuration files, build files, documentation, and other files intended to be used to modify or build the Software. **"Binary Version"** means any version of the Software, whether modified or unmodified, that has been compiled, packaged, bundled, or otherwise transformed into a form intended for execution by a computer without requiring the recipient to compile the Software from Source Code. Binary Versions include, without limitation, executable files, installers, application packages, operating-system packages, container images, virtual machine images, firmware images, and other precompiled or executable distributions. **"Internal Use"** means use of the Software by an individual, or by an organization for its own internal purposes, including commercial internal purposes, without providing a Binary Version to a third party. **"Copyright Holder"** means Sascha Ludwig, astrastudio.de, or any other person or entity expressly identified as a copyright holder for particular portions of the Software. ## 2. Copyright The Software is protected by copyright and other applicable intellectual property laws. Except for contributions and third-party components that are subject to separate license terms, the Copyright Holder retains all rights, title, and interest in the Software. ## 3. License Grant Subject to the terms and conditions of this License, the Copyright Holder grants you a worldwide, non-exclusive, royalty-free license to: 1. access and use the Source Code; 2. copy the Source Code; 3. modify the Source Code; 4. create derivative works based on the Source Code; 5. distribute the Source Code, whether modified or unmodified; and 6. compile, build, install, execute, and use the Software and modified versions of the Software for Internal Use. The permissions above apply to private, educational, research, and commercial Internal Use. No fee is required for the rights granted under this section. ## 4. Source Code Redistribution You may redistribute the Source Code, whether modified or unmodified, provided that: 1. each redistribution retains this License; 2. each redistribution retains all applicable copyright notices and attribution notices; 3. you clearly identify substantial modifications where reasonably practicable; and 4. you do not remove or alter notices identifying the Copyright Holder or other applicable copyright holders. Modified Source Code may be distributed under this License. You may publish modified versions of the Source Code, including forks and repositories containing modified versions of the Software. ## 5. Compilation and Internal Use You are expressly permitted to compile or otherwise build the Software, including modified versions, for your own use. You may: - compile the Software yourself; - create your own builds; - create customized builds; - install your own builds on computers and systems under your control; - use your own builds for commercial purposes; - deploy your own builds within your organization; and - allow employees and contractors acting solely on your behalf to use such builds for your Internal Use. The creation, installation, execution, or use of a Binary Version for Internal Use does not constitute redistribution and is expressly permitted by this License. ## 6. Restriction on Binary Redistribution You may NOT redistribute, publish, sell, rent, lease, sublicense, transfer, or otherwise make available to any third party any Binary Version of the Software without prior written permission from the Copyright Holder. This restriction applies regardless of whether the Binary Version is: 1. modified or unmodified; 2. provided free of charge or for payment; 3. distributed publicly or privately; 4. distributed individually or as part of another product or package; or 5. distributed by download, physical media, network transfer, container registry, package repository, application store, or any other means. For the avoidance of doubt, the following activities require prior written permission from the Copyright Holder: - publishing a compiled version on a website; - publishing a release containing compiled versions on GitHub or another code-hosting platform; - distributing an installer; - distributing an operating-system package; - publishing a Docker or other container image containing the Software; - including a compiled version in another software product; - providing a compiled version to customers, clients, partners, or other third parties; and - selling or giving away a compiled version of the Software. For the avoidance of doubt, merely compiling, building, installing, executing, or using the Software does not constitute redistribution. ## 7. Official Binary Versions The Copyright Holder may create, publish, license, sell, and otherwise distribute official Binary Versions of the Software. The Copyright Holder may charge fees for official Binary Versions and may determine the terms under which such Binary Versions are provided. Nothing in this License grants any third party the right to redistribute an official Binary Version. ## 8. Written Permission for Binary Distribution The Copyright Holder may, at its sole discretion, grant written permission to distribute Binary Versions. Such permission may be: - limited to a particular person or organization; - limited to a particular version; - limited to a particular number of copies; - limited to a particular distribution channel; - limited in time; or - subject to additional terms or fees. Unless explicitly stated otherwise in writing, permission to distribute one Binary Version does not constitute permission to distribute other versions. ## 9. No Trademark License This License does not grant any rights to use the names "OnAirScreen", "Sascha Ludwig", "astrastudio.de", or any associated trademarks, logos, product names, or branding, except as necessary to accurately identify the Software and comply with this License. Modified versions should not be presented as official releases of OnAirScreen. ## 10. Third-Party Software and Contributions This License applies only to portions of the Software for which the Copyright Holder has the necessary rights to grant the permissions contained herein. Third-party software, libraries, assets, and contributions may be subject to separate copyright and license terms. Nothing in this License is intended to replace, restrict, or supersede a separate license applicable to a third-party component. Where required, the applicable third-party license terms must be retained and complied with. Third-party components shipped with OnAirScreen are documented in THIRD_PARTY_LICENSES.md. ## 11. No Additional Restrictions on Source Code The Copyright Holder does not require payment, royalties, or registration for the rights granted to the Source Code under this License. You may fork the project and maintain your own modified version of the Source Code. However, the restriction in Section 6 continues to apply to Binary Versions derived from the Source Code. ## 12. Contributions Unless otherwise agreed in writing, any contribution submitted specifically for inclusion in the Software is provided to the Copyright Holder under terms that permit the Copyright Holder to use, modify, reproduce, distribute, and sublicense the contribution as part of the Software under this License. Contributors retain ownership of their original copyright in their contributions unless they expressly transfer that ownership. The Copyright Holder may request separate written confirmation of these rights from individual contributors. ## 13. Compliance with Applicable Law Nothing in this License is intended to prohibit or restrict any use that cannot legally be prohibited or restricted under applicable law. In particular, mandatory statutory rights and exceptions applicable to computer programs remain unaffected. ## 14. Termination This License and the rights granted under it terminate automatically if you materially violate its terms. Rights that have already been validly exercised before termination remain subject to this License to the extent permitted by applicable law. The Copyright Holder may, at its discretion, reinstate the rights granted by this License if the violation is remedied. ## 15. Disclaimer of Warranty THE SOFTWARE AND SOURCE CODE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE COPYRIGHT HOLDER DISCLAIMS ALL WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. THE COPYRIGHT HOLDER DOES NOT WARRANT THAT THE SOFTWARE WILL BE ERROR-FREE, SECURE, OR SUITABLE FOR ANY PARTICULAR PURPOSE. ## 16. Limitation of Liability TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE COPYRIGHT HOLDER SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF DATA, PROFITS, REVENUE, BUSINESS, OR BUSINESS INTERRUPTION ARISING OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THIS LICENSE. NOTHING IN THIS LICENSE EXCLUDES OR LIMITS LIABILITY TO THE EXTENT THAT SUCH LIABILITY CANNOT LAWFULLY BE EXCLUDED OR LIMITED. ## 17. No Obligation to Provide Support Nothing in this License creates an obligation for the Copyright Holder to provide support, maintenance, updates, bug fixes, security fixes, or future versions of the Software. ## 18. No Obligation to Continue Distribution The Copyright Holder may discontinue, suspend, or change the distribution of official Binary Versions of the Software at any time. ## 19. Entire License This License constitutes the complete terms governing the rights granted by the Copyright Holder with respect to the Software, except where separate license terms expressly apply to particular components. If any provision of this License is held to be invalid or unenforceable, the remaining provisions shall remain in effect to the extent permitted by applicable law. ## 20. Contact For questions regarding this License or requests for permission to distribute Binary Versions, please contact: Sascha Ludwig astrastudio.de --- Copyright (c) 2012-2026 Sascha Ludwig, astrastudio.de OnAirScreen is provided under the terms of the OnAirScreen Source-Available License.