 Copyright law (where an "incorrect" or ambiguous numeral may invalidate a copyright claim, or affect the termination date of the copyright period) it is desirable to strictly follow the usual modern standardized orthography.This section defines a standard form of Roman numerals that is in current, more or less universal use, is unambiguous, and permits only one representation for each value.It does not attempt to either endorse or refute every combination of Roman numeral symbols that has been, could be, or is used.