Viacom spokesperson disputed the findings: "The
Vidmeter study undercounts the volume of copyrighted content on YouTube by a significant margin." Stolen content on YouTube can show up in several different clips. Since there are so many versions of
the same thing, and since only those clips flagged by media companies are removed (as per the Digital Millennium Copyright Act), it's impossible to tell how many YouTube users have consumed pirated
material by only checking removed content.
For example, clips of "South Park," a Viacom-owned television program, still appear on YouTube despite the company's mandate that all its content be taken down. Added the Viacom spokesperson: "YouTube's site is designed in ways that make it impossible for rights holders to locate all of their copyrighted content, so even a robust take down notice program will miss significant amounts of copyrighted material."