Legal minds of HN: would the Sony vs Hotz case have been thrown out if this provision was in place at the time?
Hotz just reversed and found an exploit on his local machine. Seems to be exactly what these provisions are covering.
http://ifixit.org/blog/7475/repair-coalition-wins-exemptions... is a bit more clear on the types of things that will be allowed under this.
As for the specifics of jailbreaking:
"The Register also confirmed that the exemption for gamers should not extend to jailbreaking of console software because such jailbreaking is strongly associated with video game piracy."
https://www.federalregister.gov/documents/2015/10/28/2015-27...