Be careful with that. The exemptions do not absolve you from the "trafficking" provisions of the DMCA according to the Library of Congress. So you're allowed to do it, but not to "traffic" in the necessary tools (or software) to actually make it happen.

Yes, that is really, really stupid. Don't just take my word for it:

http://www.citmedialaw.org/legal-guide/circumventing-copyrig...