PubMed Central Open Access Subset (PMC OA)

Not all articles in PMC are available for text mining and other reuse, many have copyright protection, however articles in the PMC Open Access Subset are made available for download under a Creative Commons or similar license that generally allows more liberal redistribution and reuse than a traditional copyrighted work.

并非PubMed中央数据库（PubMed Central，PMC）收录的所有文章均可用于文本挖掘及其他形式的再利用，其中多数作品受版权保护。不过，PMC开放获取子集（PMC Open Access Subset）中的文章可基于知识共享（Creative Commons）或类似许可协议进行下载，此类许可通常比传统受版权保护的作品允许更为宽松的再分发与再使用行为。