> A famous example of such a defense being denied occurred in In re Aimster Copyright Litigation, 334 F.3d 643 (7th Cir. 2003), in which the defendants argued that the file-swapping technology was designed in such a way that they had no way of monitoring the content of swapped files. They suggested that their inability to monitor the activities of users meant that they could not be contributing to copyright infringement by the users. The court held that this was willful blindness on the defendant's part and would not constitute a defense to a claim of contributory infringement.