Led by their kings, the Bubi were well aware of the slave trade in the region and, for centuries, were highly guarded of outsiders.

It now read, The identity of the Klingon you seek is highly guarded.

The committee members are highly guarded about their deliberations and rarely let slip advance word on the winner.

The highly guarded, restricted compound in a wooded area southwest of Moscow is the headquarters of the K.G.B.'s First Chief Directorate, its intelligence and espionage arm.

Each manufacturer has developed its own proprietary lasts for producing boots, which are considered trade secrets and are highly guarded.

Based in Guatemala City, the Defence Ministry is highly guarded, and the President of Guatemala frequently visits.

Next to the Makaviti Temple, the Aridimi one is said to be the most highly guarded on our world.

"PIN's are highly guarded and regarded," he said, adding that Visa "certainly wouldn't encourage" its member banks to sponsor similar mailings.

Cres has its very own fresh water lake, which is very highly guarded and illegal to swim and fish in.

For nearly 30 years the mathematic formula used to determine the exact height of the enormous wing was thought to be a highly guarded Chrysler secret.