The key difference is that proxy servers don't copy content. They reflect it. You can put any URL on the internet behind a proxy server-- that does not mean th

The key difference is that proxy servers don't copy content. They reflect it. You can put any URL on the internet behind a proxy server-- that does not mean that the proxy server has already copied the entire internet. Nor does it mean that once a URL has been proxied by a proxy server does the content remain cached or copied-- since in our case at Hypothesis, and we presume at Genius, it does not. This is a key distinction that separates proxies from caches and archives.