这通常意味着它有一个自由开源的版本(甚至带有一份OSI认可的许可证书)，但自由付费才能使用并且拥有更多特性的版本才是该厂商的主要产品。

This often means there's a free, open source (sometimes even with an OSI-approved license) version of a product available, but paid versions with proprietary features are a vendor's primary product.

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