On: Show HN: Hndex.org – a full-text search engine of articles submitted to HN

[freediver]

I wonder how cached results are created and is there some kind of copyright violation because they store the content.

[JoshuaRLi → freediver]

I suspect it might be something mentioned in https://github.com/masukomi/arc90-readability. I believe it's what powers "readability" view in modern browsers (firefox https://github.com/mozilla/readability, safari).