I think the reference is to the idea that a correspondent might do a unencrypted CC of a message that contains previously encrypted text as per this infamous an

I think the reference is to the idea that a correspondent might do a unencrypted CC of a message that contains previously encrypted text as per this infamous anti-PGP rant: * https://latacora.micro.blog/2019/07/16/the-pgp-problem.html https://latacora.micro.blog/2019/07/16/the-pgp-problem.html