Though the DMCA was signed into law in 1998, the rules of engagement are still being debated. This is your chance to make "reply comments," and address the arguments raised by the entertainment giants. The EFF link above sorts important previous comments straightforwardly into "pro-freedom" and "anti-freedom," for obvious reasons.
If you haven't yet added your voice, you now have nearly two weeks to do so. You might want to read the thread about the last round of comments on the same issue, and emulate the comments you find most persuasive.