imprimatur
An official license to publish or print something, especially when censorship applies.
The Cheats · A Comedy · Written in the Year, M.DC.LXII. Imprimatur, Roger L'estrange. Nov. 5. 1663. By John Wilson
Any mark of official approval.
Children, the final imprimatur to family life, are being borrowed, adopted, created by artificial insemination.
Where it comes from
From Latin imprimātur (“let it be printed”), third person singular present subjunctive passive form of imprimere (“to imprint”).
Adapted from the Wiktionary entry imprimatur (CC BY-SA 4.0).