He's recovering from intestinal surgery and an undisclosed illness that's treated as a state secret.
The Supreme Court accepted the idea of a state secret privilege more than 50 years ago.
Official figures, however, remain a state secret, according to the BBC's Martin Patience in Beijing.
Grain reserves are said to be at a record high although their precise level remains a state secret.
Treating financial dealings with African governments as a state secret, as China does, aids embezzlers and fuels suspicion.
In February, a government bureau sparked widespread public grumbling when it said soil-quality statistics were a state secret.
Resisting calls for more transparency, President Obiang has for long held that oil revenues are a state secret.
The full extent of soil pollution is deemed a state secret, and activists who expose polluters are regularly imprisoned.
The oil revenues of Equatorial Guinea, where three-quarters of the population live below the poverty line, are a state secret.
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To make matters more complicated, exact figures on the Russian stockpile of palladium are unknown because the country keeps them a state secret.
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The report also speculated that non-Chinese demand will fall in the near term, which is also hardly a state secret worthy of WikiLeaks.
"The central government will be in a position to decide what is a state secret, " says Siu-Lan Law, the general secretary of the Hong Kong Journalists Association.
While New York-Presbyterian did fail to notify the police there had been a shooting injury, hospitals are trained to guard patient privacy like it's a state secret.
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Although the exact composition of this basket is considered by China to be a state secret, experts believe that it may include anywhere from 15 to 20 different currencies.
Mr Maduro is thought to be one of just a few people who have had access to Mr Chavez's diagnosis, details of which have not been revealed and which has been treated like a state secret.
The number of executions in China is a state secret, but the Dui Hua Foundation in California, which promotes improved legal rights in China, estimates that it fell from around 8, 000 in 2007 to 4, 000 last year.
Anger that authorities held on to data with potentially serious health consequences was exacerbated by the use of the state-secret argument common throughout the government to justify refusing information requests.
Also, the latest paroles of convicted terrorists such as US citizen, Lori Berenson, and revelations of financial reparations from the state done in secret during the Toledo regime have produced a backlash against the Garcia administration, with people blaming him for not stopping what they consider blatant injustices.
He and His family left Israel to escape the state, traveling in secret in defiance of King Herod.
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The State Bank makes no secret of the fact that it is trying to force the banks to pay more attention to real-world investments in companies and lending to individuals.
President Obama and former Secretary of State Hillary Clinton kept secret who was responsible for the unconscionable and or incompetent decisions that led to the tragic deaths of four Americans in Benghazi, Libya, last year.
In the second case, involving a client Phillips successfully represented in a whistleblower suit against General Electric, the client sued him in California State Court, alleging secret financial ties between the taxpayer group and Phillips' firm.
But any state pledge was granted in secret, out of shame at the appearance of intervention.
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