It's getting tougher and tougher to break copyright law on YouTube these days. The site now performs frequent purges of television shows and other proprietary content uploaded by users. But those forbidden files can still be had. They've largely migrated to DailyMotion.com, another video-uploading site that replicates YouTube's model of user-provided videos. DailyMotion, by contrast, seems to do little if any regulation of copyrighted material, nor does it limit the lengths of clips. At any given time, DailyMotion hosts hundreds of copyrighted television episodes, allowing users to watch the shows free of charge and without commercials. And try as they...