gwern branwen wrote:
Reading that page leads me to believe that this is a quick hack which filters all edits to the relevant pages, and somewhat of a performance hog. Doesn't seem like something that could be applied to thousands and thousands of images or pages.
I wouldn't call it a quick hack, and it is fast enough in its current application. But it is most certainly not intended for fair use enforcement and it would indeed scale quite poorly if an attempt was made to use it that way. The filter applies to page views, not edits, so it acts retroactively for history views and diffs.
-- Tim Starling