The tracker provides the user only with .torrent files which contain no copyrighted data.

网站负责人说：“这些tracker服务器只是提供用户torrent文件，而这些torrent文件并没有复制目标文件的内容。

youdao

Digital watermarking is the enabling technique to prove ownership on copyrighted material, detect the originator of illegally made copies, monitor the usage of the copyrighted multimedia data.

数字水印技术可用于版权资源保护、检查非法复制、监控版权多媒体数据使用。

youdao

That large chunk of copyrighted data will no longer be publicly accessible by any means, short of separately negotiated agreements with those approximately 100 private sources (have fun).

FORBES: Statistical Tools and Errands for Fools