In a 2009 case, Netbula, LLC v. Chordiant Software Inc., defendant Chordiant filed a motion to compel Netbula to disable the robots.txt file on its web site that was causing the Wayback Machine to retroactively remove access to previous versions of pages it had archived from Nebula's site, pages that Chordiant believed would support its case.

What 2009 court battle involved the Wayback Machine?