What are the rules that govern the use of quotations from reviews on the covers of books? On the cover of my Vintage paperback of Roberto Calasso's Literature and the Gods is the line:

"Calasso can take your breath away."
--The New Yorker
The actual sentence, from a Briefly Noted review in the May 7, 2001 issue, is:
"Calasso likes to go for the big, sweeping effect, and once in a while he can take your breath away."
(Yay for The Complete New Yorker DVD set, which also discloses a 1993 profile of Calasso that's printing out as I type.) I honestly don't know if this is kosher or not.