A UUID generator uses a complex algorithm, which takes into account factors, such as the current date and time, to produce a hexadecimal number that has a statistical guarantee of uniqueness.
Procedural due process. Principle required by the Constitution that when the state or federal government acts in such a way that denies a citizen of a life, liberty, or property interest, the person must first be given notice and the opportunity to be heard. See Due Process.
Substantive due process, just as procedural due process, extends beyond the context of criminal prosecutions. For example, the right of privacy, although not explicitly stated in the Bill of Rights, is a substantive right of the people that stems from the Due Process Clause of the Fifth Amendment.