# Penumbra An HTTP application-layer proxy firewall. Penumbra is based on the [Umbra firewall shim][umbra]. [umbra]: https://github.com/umbra-firewall/umbra ## License Penumbra is licensed under Apache 2.0 license OR MIT license, at your preference. See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT) for details.