Tim Cushing, reporting for TechDirt (condensed): Those of us who dwell on the internet already know the Internet Archive's "Wayback Machine" is a useful source of evidence. So, it's heartening to see a federal judge arrive at the same conclusion, as Stephen Bykowski of the Trademark and Copyright Law blog reports.From the report: The potential uses of the Wayback Machine in IP litigation are powerful and diverse. Historical versions of an opposing party's website could contain useful admissions or, in the case of patent disputes, invalidating prior art. Date-stamped websites can also contain proof of past infringing use of copyrighted or trademarked content.From TechDirt: The defendant tried to argue that the Internet Archive's pages weren't admissible because the Wayback Machine doesn't capture everything on the page or update every page from a website on the same date. The judge, after receiving testimony from an Internet Archive employee, disagreed. He found the site to a credible source of preserved evidence -- not just because it captures (for the most part) sites as they were on relevant dates but, more importantly, it does nothing to alter the purity of the preserved evidence.