License

VoicEra is distributed under the Apache License 2.0.

VoicEra is open source under the Apache License 2.0, Copyright (c) 2026 COSS India. The full license text is reproduced below — you do not need to open any other file or page to read it. It also lives at LICENSE in the repository root, which is the version that governs in case this copy and that one ever drift.

What the Apache License 2.0 permits

You may use, reproduce, modify, merge, publicly display, publicly perform, sublicense, and distribute the software — including commercially and in closed-source products.

There is no copyleft obligation. You do not have to open source work that builds on VoicEra.

What you must do in return

• Include a copy of the license. Any distribution of the software (or of a derivative work) must include a copy of this license.
• Mark changed files. If you modify a file and redistribute it, add a prominent notice in that file saying you changed it.
• Keep existing notices. Copyright, patent, trademark, and attribution notices already in the source must be preserved in any derivative you distribute.
• NOTICE file. The license lets a project ship a NOTICE file with extra attribution text that redistributors must carry forward. VoicEra does not currently ship one — so there is nothing extra to carry forward beyond the license text itself. If that ever changes, this page will say so.
• No warranty, no liability. The software is provided “as is.” Contributors and the Licensor carry no warranty and no liability for damages arising from its use.

Apache 2.0 also includes an express patent grant: each contributor licenses you to use any of their patents that are necessarily infringed by their contribution. That patent grant terminates automatically for anyone who files patent litigation claiming the software infringes their patents — so this permissiveness does not extend to patent aggression against the project or its users.

Do not describe VoicEra as proprietary or “all rights reserved” anywhere. The repository licence is Apache 2.0 only.

Copyright notice for your files

If you add a new source file and want to carry the standard header, use this (this is the exact boilerplate from the license’s own appendix — no need to look it up elsewhere):

Copyright 2026 COSS India

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

This is optional per-file boilerplate, not a separate obligation — the license already covers the file even without it.

What the licence does not cover

The Apache 2.0 grant applies to this repository’s source code. It does not extend to:

Thing	Governed by
Models you download and run	Each model’s own licence — several are gated and carry their own terms. See Model server.
Cloud AI provider usage	Your contract with that vendor.
Telephony provider usage	Your contract with Vobiz, Plivo, or another carrier.
Container base images and Python dependencies	Their own licences.
Call recordings, transcripts, and contact data	You. VoicEra is self-hosted, so this data is yours and your obligation.

Model weights are the most common surprise. A permissive platform licence does not make a restrictively licensed model redistributable. Check each model’s terms before deploying it — the per-model pages under Model server note where weights are gated.

Contributions

Contributions are accepted under the same Apache 2.0 terms. By opening a pull request you agree your contribution may be distributed under the project licence. See Contributing.

Full license text

Related

• Code of conduct
• Security policy
• Contributing