The subscriptions and data feeds are sold to the users or are embedded in other Websites sold and through a variety of data redistributors.
饲料的订阅和数据出售给用户或嵌入其他网站销售，并通过各种数据的再发布。
2
Redistribution of the unmodified work must also preserve the license. And all redistributors must give users access to the software's source code.
对未修改过的产品的重新分配也必须保留许可证，所有重新分配过的产品必须给使用者源代码。
3
GPL version 2, in 1991, was designed also to prevent patent holders from using their patents to impose licenses on redistributors in a way that would make the software non-free.