Classified information is material that a government body deems to be sensitive information that must be protected. Access is restricted by law or regulation to particular groups of people with the necessary security clearance and need to know, and mishandling of the material can incur criminal penalties. A formal security clearance is required to view or handle classified documents or to access classified data. The clearance process requires a satisfactory background investigation. Documents and other information must be properly marked “by the author” with one of several (hierarchical) levels of sensitivity—e. g. restricted, confidential, secret and top secret. The choice of level is based on an impact assessment; governments have their own criteria, which include how to determine the classification of an information asset, and rules on how to protect information classified at each level. This often includes security clearances for personnel handling the information. Although “classified information” refers to the formal categorization and marking of material by level of sensitivity, it has also developed a sense synonymous with “censored” in US English. A distinction is often made between formal security classification and privacy markings such as “commercial in confidence”. Classifications can be used with additional keywords that give more detailed instructions on how data should be used or protected. 
The existence of such powerful roaring winds kicking up violent and powerful dust storms suggests that the underlying sand can be set in motion, too, and that the giant dunes covering Titan's equatorial regions are still active and continually changing.
Simply put, resistance to the creation of a space frontier originates with the insecurities of Western leaders. First, it is clear that everything changes with the emergence of a frontier. Established power structures are usually shaken, not reinforced. (If this is not clear, try reading Walter Prescott Webb's The Great Frontier, particularly the last chapter, and Divided We Stand: The Crisis of a Frontierless Democracy, by the same author.)
The Farmer's Almanac defines a blue moon as the third full moon in a season of four full moons. This is the correct definition of a blue moon. Since a season is three months long, most seasons will have three full moons. However, on occasion a season will have four. When this happens, the third is a true blue moon.