This article provides an in‐depth summary, exploration, and review of the Tcl/Tk License. It covers its purpose, origins, usage, strengths, pitfalls, and comparisons with other open source and fair code licenses, including the OCTL, MIT License, Apache 2.0, and GNU GPL. It also addresses topics like dual licensing, vulnerabilities to exploitation, and industry success stories, making it a comprehensive resource for developers and researchers.