Free Software Foundation provides short summaries of the key open source licenses, including whether the license qualifies as a free software license or a copyleft license. Also includes a discussion of what constitutes a free software license or a copyleft license (e.g., a Copyleft license is a general method for making a program or other work free, and requiring all modified and extended versions of the program to be free as well.)
自由软件基金会提供关键的开源许可协议的简短摘要，包括许可协议是否有资格作为一项自由软件许可协议，或一项 Copyleft 许可协议。还有包括什么是一项自由软件许可协议或或 Copyleft 许可协议的讨论（例如 Copyleft 许可协议是一种通用的方法，对于制作一个程序或其他作品，并要求所有修改和程序的扩展版本都应是自由的。)