Obfuscation usually occurs when a party is obliged or required to provide information that may not present either themselves or their prefered interpretation of the information in the way they would like. Obfuscation is the concealment of information or its meaning within obtuse language or vague terms.
Incidence:
Technical agencies, governments, the military and politicians are all known to obfuscate the facts of matters they do not wish the general public to comment upon.