High School Students' Copyright Lawsuit Against Anti-Plagiarism Site Rejected:

The opinion is here. The court quite correctly accepts the site's fair use claim. The court also accepts the site's clickwrap contract defense (a conclusion that might be more controversial, though I think the site's reasoning is still correct); but that doesn't really matter to the bottom line given the fair use result.

For more on the case, see my initial post from when the case was filed last year. Thanks to David Post for the pointer.