nihil obstat
Concise Oxford English Dictionary © 2008 Oxford University Press:
nihil obstat /ˌnʌɪhɪl ˈɒbstat, ˌnɪhɪl/
▶noun (in the Roman Catholic Church) a certificate that a book is not open to objection on doctrinal or moral grounds.
– origin L., lit. ‘nothing hinders’.
'nihil obstat' also found in these Oxford entries:

