Licenses

Cuttlefish itself is Revised BSD (BSD 3-Clause) licensed, in both the C++ and the Rust implementations.

C++ dependencies

The C++ Cuttlefish bundles or links the following:

Library	License
BBHash	MIT
Boost C++ Metaprogramming	Boost Software License
compact_vector	MIT
cxxopts	MIT
fmt	MIT
KMC	GNU GPL 3
kseq	MIT
spdlog	MIT
xxHash	BSD

KMC and the GPL

KMC is GPL 3 licensed. That is the most restrictive license in the C++ dependency set, and it governs what you may do with a distributed binary of the C++ Cuttlefish. The Rust implementation does not use KMC.

Rust dependencies

The Rust Cuttlefish 3 depends only on crates.io packages, all permissively licensed (MIT and/or Apache-2.0):

Crate	Purpose
flate2 (with zlib-rs)	gzip decompression of input
hashbrown	hash tables
lz4_flex	bucket compression
libc	fallocate hole punching, descriptor limits
rayon	data parallelism
scc	concurrent containers
xxhash-rust	hashing
tikv-jemallocator / mimalloc	optional allocators

For the exact versions and their full license texts, see Cargo.lock and run:

cargo tree