December 2020
Intermediate to advanced
552 pages
20h 7m
English
The U.S. government also classifies its data and specifies rules for using classified information. President Barack Obama signed Executive Order 13526 in December 2009, which describes a system for classifying national security information. The Order establishes three classification levels—confidential, secret, and top secret. The difference between the levels is the amount of harm that could be caused to U.S. security if the data were disclosed to an unauthorized person.
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