seal of secrecy

See: censorship
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References in classic literature ?
He had told her how flirtatious he was and had amused her often with the narration of some adventure which Griffiths under the seal of secrecy had imparted to him.
Moreover, the confessional, with its seal of secrecy, further enabled the abuse by providing a context for expiation of this sin.
6 : something (as a pledge) that makes safe or secure <The deal was made under seal of secrecy.>
She then broke the seal of secrecy that shrouded the eventual breaking of the code.
However, in spite of revelation upon revelation, Mrs Andreasen's supporters have never managed to demonstrate that she ever succeeded in uncovering the slightest malfunctioning unknown to the Commission, or worse still, covered by the seal of secrecy. All the facts identified by Mrs Andreasen had already been noted by the Court of Auditors and European Commission and, from 1999, by the expert group whose explosive report led to the collective resignation of the Jacques Santer Commission.