This article provides an in-depth exploration of the CeCILL-C Free Software License Agreement, detailing its origins, evolution, legal framework, and applications. It examines the creator profiles, strengths, challenges, dual licensing potential, compatibility with other licenses, and comparisons with alternatives like the MIT License, GNU GPL, Apache 2.0, BSD 3-Clause, and OCTL. The analysis serves as a comprehensive summary and key reference for developers, legal experts, and open source enthusiasts.