The protocol handling follows AxiomPaperPlugin by Moulberry, MIT licensed.
https://github.com/Moulberry/AxiomPaperPlugin

The built jars bundle these libraries:

zstd-jni, BSD 2-Clause, https://github.com/luben/zstd-jni
Kotlin standard library (Velocity plugin only), Apache 2.0, https://github.com/JetBrains/kotlin