Case Studies on remixware.com

Case Study: CoyIM Took Code From Another XMPP Client and Kept Its Licence

Mon, 26 Oct 2026 00:00:00 +0000

CoyIM is a chat client for the XMPP protocol, written in Go, that sets safe and secure options by default. Its README says it is built upon xmpp-client, an earlier XMPP client at github.com/agl/xmpp-client. CoyIM is under GPL-3.0. xmpp-client uses the three-clause BSD licence that Go itself uses, under the line “Copyright (c) 2012 The Go Authors. All rights reserved.” BSD code can go into a GPL-3.0 program, as long as the BSD notice goes with it.

Case Study: Pip Ships 18 Vendored Libraries With Their Licences, Except One NOTICE

Mon, 26 Oct 2026 00:00:00 +0000

pip, the tool that installs Python packages, can’t count on any other package being installed first. So it vendors what it needs: copies of 18 releases from PyPI, kept in src/pip/_vendor and listed in its vendor.txt. pip itself is MIT. Eight of the libraries it carries are MIT too and four are Apache-2.0. The rest are one each under BSD-3-Clause, BSD-2-Clause, ISC, MPL-2.0 and PSF-2.0, plus packaging, which offers a choice of Apache-2.0 or BSD-2-Clause.

Case Study: Typer Copied Code From Click, Then Shipped the Click Licence

Mon, 26 Oct 2026 00:00:00 +0000

Typer is a popular Python library for building command line tools. It began as a layer on top of Click, the command line library from the Pallets project, and for years it listed Click as a dependency. Typer is under the MIT licence. Click is under BSD-3-Clause, which lets anyone reuse its code as long as copies of the source keep Click’s copyright notice and licence text.

We ran Remixware 0.2.1 on two typer releases, each compared with the Click release of its day: typer 0.12.5 with Click 8.1.7, and the current typer 0.27.3 with Click 8.3.1. The full reports are in the Remixware repository, and every number here comes from them.