The product is dual licensed with a limited version offered under GPL version 2 and a more comprehensive product offered via a commercial license.
该产品具有双重许可：有限功能版遵循gpl版本2许可协议，而更全面的产品则按商业许可提供。
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.
1991年第2版GPL的设计，同样是为了防止持有专利者利用他们的专利权以某种会使软件变得非自由的手段强加许可协议给重发布者。
Section 2 says that modified versions you distribute must be licensed to all third parties under the GPL.
第2节声明你发布的修改版本必须以GPL方式授权给所有第三方团体。
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