The Copyright Office requested further information from the OTW and other groups that testified during the DMCA Anticircumvention Hearings on May 6-8. These hearings were designed to entertain testimony in favor of and against DMCA exemptions for media educators (including K-12 teachers), documentary filmmakers, vidders, and other noncommercial remix artists.
For those who are interested, our answers are linked here.
The first is a joint answer, collaboratively written, submitted, and signed by the OTW, the Electronic Frontier Foundation, and a number of library associations (ALA, AALA, ARL, ACRL), film and media studies professors, and documentary filmmakers and their organizations. (Joint Supporters Response To Supplemental Questions On Proposed DVD-Related DMCA Exemptions (PDF).)
The second is a separate response co-written specifically by the OTW and the EFF to address the particular needs of vidders and other remix artists. (OTW & EFF Response To Supplemental Questions, Specific To Noncommercial Video Remix Creators (PDF).)