The legal copyright notice, including legit variations.
The first element is always the original metadata value. Additional elements represent legit variations:
If a single occurrence of a four-digit number (e.g. 2022) is present, it is interpreted as a year number and variations are generated for the past back to the year 2000.
Consider a perpetual licence key that has been purchased for this copyright metadata:
'Copyright (C) 2010 Some Company, all rights reserved.'
The year number variation ensures that the same licence key still works when the year number in the copyright metadata is changed, for example:
'Copyright (C) 2022 Some Company, all rights reserved.'