It was formerly freeware with limitations on commercial use, but since 2011 it is available under a free software/open source (3-clause BSD license) license as a part of the open source WebRTC project.
它以前是限制商业使用的免费软件，但从2011年开始，它可用于自由软件/开源许可（3BSD许可证）——作为WebRTC开源项目的一部分。