BSD许可证
The BSD license family is one of the oldest and most broadly used license families in the Free and open-source software ecosystem. Also, many new licenses were derived or inspired by the BSD licenses. Many FOSS software projects use a BSD license, for instance the BSD OS family (FreeBSD etc.), Google's Bionic or Toybox. the BSD 3-clause license ranked in popularity number five according to Black Duck Software and sixth according to GitHub data.