The Corona program was officially classified top secret until 1992.

The results of the tests were classified until 1997.

The matter will be classified until such time as we contact you again.

The code was so successful that it remained classified until 1968.

The administration has summarized the main benefits of the agreement for months, but the text was kept classified until today.

The total figure for the nation's intelligence budget was classified until 1997.

All have been classified on national security grounds until today.

Although the disorder has probably been present throughout human history, it was not classified accurately until the late 19th century.

All information about the town was highly classified until the bombing of Hiroshima.

The school was classified as Catholic until 1989 when it became Public.