I'm actually developping a "zen reading mode" (I don't know if there's a distinct way to say it in english) like Pocket for web articles in my own website.
Right now, I only save basic data on my database (Article title, thumbnail, author and URL) and when a user selects an article to be read, my website is performing a request to retrieve the article and then processes it to display it in "zen reading mode". I don't actually have the "zen" version of the article in my database.
But for performance issue, I'm wondering if I could just save the full "zen" version in my own database instead of querying the original URL of the articles.
Of course, either way, there are links to the original article and the author (if there's not, it's the domain it was published in) is displayed.
So I was just wondering if there was any laws or guideline about "copying" articles on the web and this kind of stuff.