It's a violation of the DMCA to break DRM. Actually, I think it is technically in violation of the DMCA, but the Library of Congress recently gave a 3-year exception to jailbreaking phones. http://arstechnica.com/tech-policy/news/2010/07/apple-loses-...
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:
Yes, that is really, really stupid. Don't just take my word for it:
http://www.citmedialaw.org/legal-guide/circumventing-copyrig...