1. In a system comprising a communications network connecting a plurality of network servers and a plurality of computers, a network server comprising: a verification database comprising; at least one master table of contents identifier corresponding to each of a plurality of sets of digitized content; and at least one master songprint identifier corresponding to each of the plurality of sets of digitized content; and wherein the network server is programmed to; receive at least one of a plurality of selections of table of contents identifiers from at least one of the plurality of computers; receive at least one of a plurality of songprint identifiers from the at least one of the plurality of computers.