Check out the Licenses link on the Apache Couch DB site, which links to the main Apache license site.
In general, the Apache licenses are pretty open and allow you to do just about whatever you want with them, provided that you attribute the original work you use to Apache, distribute the license when you distribute any Apache projects, and note any modifications you made.
To determine what the License means for your specific use, please contact a friendly lawyer to advise you on legal issues.
CouchDB, like all Apache projects, is licensed under The Apache License which permits all uses, including commercial ones. You most certainly do not have to pay anything to use CouchDB.
你关于 MySQL 的例子是不正确的。即使在商业环境中，您也可以自由使用开源版本的 MySQL。确实，如果您需要额外的功能或支持，可以选择付费版本，但与 CouchDB 一样，在商业环境中使用 MySQL 没有限制。
Your example about MySQL is incorrect. You are free to use the open-source version of MySQL even in a commercial environment. It is true that there is a paid for version if you want extra features or support but like CouchDB there is no restriction on using MySQL in a commercial environment.
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查看 Apache Couch DB 上的许可证链接 站点，链接到主 Apache 许可证站点。
一般来说，Apache 许可证非常开放，允许您用它们做任何您想做的事情，前提是您将使用的原始工作归因于 Apache，在分发任何 Apache 项目时分发许可证，并记下您所做的任何修改。
要确定许可证对您的特定用途意味着什么，请联系友好的律师，以就法律问题向您提供建议。
Check out the Licenses link on the Apache Couch DB site, which links to the main Apache license site.
In general, the Apache licenses are pretty open and allow you to do just about whatever you want with them, provided that you attribute the original work you use to Apache, distribute the license when you distribute any Apache projects, and note any modifications you made.
To determine what the License means for your specific use, please contact a friendly lawyer to advise you on legal issues.
与所有 Apache 项目一样，CouchDB 是根据 Apache 许可证获得许可的，该许可证允许所有用途，包括商业用途。您肯定不需要支付任何费用即可使用 CouchDB。
http://www.apache.org/licenses/LICENSE-2.0
CouchDB, like all Apache projects, is licensed under The Apache License which permits all uses, including commercial ones. You most certainly do not have to pay anything to use CouchDB.
http://www.apache.org/licenses/LICENSE-2.0
你关于 MySQL 的例子是不正确的。即使在商业环境中，您也可以自由使用开源版本的 MySQL。确实，如果您需要额外的功能或支持，可以选择付费版本，但与 CouchDB 一样，在商业环境中使用 MySQL 没有限制。
Your example about MySQL is incorrect. You are free to use the open-source version of MySQL even in a commercial environment. It is true that there is a paid for version if you want extra features or support but like CouchDB there is no restriction on using MySQL in a commercial environment.