The CueCat device was controversial, initially because of privacy concerns of its collecting of aggregate user data. Each CueCat has a unique serial number, and users suspected that Digital Convergence could compile a database of all barcodes scanned by a given user and connect it to the user's name and address. For this reason, and because the demographic market targeted by Digital Convergence was unusually tech-savvy, numerous websites arose detailing instructions for "declawing" the CueCat — blocking or encrypting the data it sent to Digital Convergence. Digital Convergence registered the domain "digitaldemographics.com", giving additional credence to privacy concerns about the use of data.