Really? Even if copyright holders litigiously suggest otherwise?
Of more practical value, does it work on pages that use JavaScript to dynamically render a page?
How do you guard yourself against user-shared copyrighted content* ? Do you delete on request from the copyright holders? Do you weed out in the shared content once in a while? Do you have some kind of policy or agreement transfering the infrigement to the sharing user in such cases ?
*Say, a user has access to some content behind a paywall, but shares it un-blocked through your service.
for example.
I was pleasantly surprised to find that Firefox will do a successful Save As of the content, even though View Source only shows the original page. And the ScrapBook plug-in also saves the page correctly.