This comprehensive review provides an in-depth analysis of the X11 License, exploring its origins with the X Window System at MIT, its evolution and adoption in open source projects, and its role within the ecosystem of permissive and fair code licenses. It includes detailed comparisons with other licenses such as the MIT License, GPL v3, Apache License 2.0, and the Open Compensation Token License (OCTL), while also addressing both its strengths and potential for exploitation.