Software incorporated in Python carries its own licences
Catalog row in Vendor License Rules · Cited
- Kind
- Restriction
- Statement
- History and License: some software incorporated into Python is under different licences, listed with the code they cover; the list of incorporated-software licences is described as incomplete. Components include Mersenne Twister, WIDE Project socket code, SipHash24, dtoa, expat (MIT-style), libffi (MIT-style), zlib, cfuhash, libmpdec (BSD-style), mimalloc (MIT), uvloop-derived asyncio code (MIT), pyzstd-derived bindings (3-Clause BSD) and the Unicode Character Database (Unicode License V3). Redistributors must carry each component's notices in addition to the PSF licence. (page undated; as published on 2026-09-27)
- Applies when
- Redistributing CPython source or binaries, or producing notices files and SBOMs for products that embed it.
- Applies to
- Python (CPython) source tree and binaries.