DouTok AI Proprietary License Effective for new original contributions first released under this notice: 19 October 2026. Copyright (c) 2026 the respective copyright holders of original DouTok AI contributions. All rights reserved, except as expressly stated below. 1. Scope and existing rights This notice covers only original DouTok AI code, documentation and assets to which their copyright holders can grant these rights. It does not claim ownership of third-party software, model weights, datasets, fonts, trademarks, user content, or material previously licensed on different terms. A file's specific license and valid earlier grants take precedence for that material. Earlier repository versions declared MIT in package metadata; any valid MIT or other earlier grant remains effective for the material it covered. This notice does not retroactively revoke those rights. 2. Limited permission for ordinary service use An authorized user may access the official DouTok AI service under its service terms and execute the client software solely as needed for that use. This includes downloading and retaining the browser/PWA cache needed for permitted offline use. No permission to operate a separate service, distribute source or binaries, or sublicense original proprietary material is granted. 3. Reserved uses Except for the limited permission above, a separate written license from the relevant copyright holder is required to copy, modify, publish, redistribute, sublicense, sell, white-label, rebrand, host, or incorporate original proprietary material into another product or service, whether commercial or noncommercial. Using that material as training or fine-tuning data for machine learning, or distributing substantial extracted portions, is likewise not licensed. Removing applicable ownership notices is not permitted. Access to a repository does not itself grant any of these rights. No trademark or endorsement rights are granted. 4. Third-party and statutory exceptions All third-party components retain their own licenses and notices. Those licenses may grant rights broader than this notice; nothing here limits them. In particular, LibreChat-derived material remains MIT, the separately built World Monitor module and its corresponding source remain AGPL-3.0, wllama and llama.cpp remain MIT, and Qwen3 model weights remain Apache-2.0. The model weights are public third-party material, not proprietary DouTok AI weights. See THIRD_PARTY_NOTICES.md and the component-specific notices. Nothing here restricts non-waivable rights, applicable statutory exceptions, or a valid prior license. User content and generated outputs follow the service terms and their applicable underlying rights; this source-code notice does not claim ownership of them. 5. Termination and remedies The limited permission in section 2 ends for a breach of this notice unless the relevant copyright holder agrees otherwise in writing. Any termination applies only to permission granted here, not independent third-party or prior rights. The copyright holders reserve remedies available under applicable law; this notice does not create automatic fines or penalties. 6. Disclaimer TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE MATERIAL IS PROVIDED "AS IS", WITHOUT WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT. COPYRIGHT HOLDERS ARE NOT LIABLE FOR CLAIMS OR DAMAGES ARISING FROM ITS USE. MANDATORY LAW AND EXPRESS SERVICE CONTRACTS PREVAIL. Requests for a separate license must be made through the official DouTok AI support contact identified in this repository or in the service. Permission must be express and in writing from the relevant rights holder.