History Q:Original use of Imprimatur / Nihil Obstat / Concordat

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One for the historical scholars here.
Sorry if this question should really go in the Clubhouse or elsewhere…

I am looking for a source for when the formalities of Imprimatur, Nihil Obstat, Concordat cum Originali were first defined.
They may have been informally in use from 400 AD, but I am looking for a verifiable historical source that indicates when these were first mandated, for example as in Liturgiam Authenticam.

Thanks in advance

Patrick
 
“Imprimatur” means “Let it be printed.”

As things were not “printed” until the invention of the printing press in the 1400/1500 or so, it’s very doubtful that this was used in 400.
 
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