Don’t know.

Their are  several Thousand of cases,
  (which after in court)
Both sides say, ’Settlement has been reached’
And if it a big, ’news’, worthy event,
the person who received the, ’settlement’,
  Can  ONLY  say: ‘A Settlement has been reached’.

Also called a, “GAG  Ordered Settlement”.

That, ’seems’ to be legal.

So perhaps a ‘contract’ which says:
‘I am Going to Rape you, and you can not say a Word’.
  (and the person Raped/Abused, agrees and signs)
Is also perfectly all right.

But, will Never see, either one of those !