They were secret until 1994, when the Pentagon captured one.

Increasingly, the way to sell a book these days is to keep it secret until the very last moment.

His illness was diagnosed in 1991, but he kept it secret until 1998.

Under that settlement, its terms remained secret until the conclusion of the related case in Federal court.

We got a note but that was secret until the next day.

The project was secret within the company, except for a small number of executives and engineers, until May 2009.

The development was kept secret until 1970 when brief details were published.

For the first time, names of all winners remained secret until the moment they received their awards.

The date is to remain secret until the last minute.

It's in their self-interest to keep it secret until the end.