In this study, we examine the impact of the Napster decision on RIAA sales. We also present a brief introduction to copyright law and DMCA. We compare RIAA sales to DVD and entertainment software sales, both before and after the Napster decision. Analysis of variance showed no differences in sales growth before Napster; that is, all industries showed similar growth. After Napster, however, RIAA showed significantly lower growth than that experienced by the movie and entertainment software industries.