There is a fundamental problem with the DMCA. It is called the US Constitution specifically: "To promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries." (Article 1, Section 8, Clause 8). The issue is the copyright length is longer than needed to 'promote the progress of science and useful arts'. As envisioned, 'limited times' was a few years not lifetime plus. Also, most works have a very limited active sales life when the vast majority of the sales occur. While not usually debated, one could argue that much of what is copyrighted fails the definition of 'useful arts'. Porn certainly would not meet the definition of 'useful arts'.