Proxima uses third party code under their own
respective licenses:

Proxima/Runtime/HttpDateParse.cs:

    https://github.com/dotnet/runtime/blob/main/src/libraries/Common/src/System/Net/HttpDateParser.cs
    Copyright (c) .NET Foundation and Contributors
    MIT License

Proxima/WebSocketSharp

    https://github.com/sta/websocket-sharp
    Copyright (c) 2010-2023 sta.blockhead
    MIT License