The original mechanics are not copyrighted. Modern clones include:
A common community workaround for expired keys involves temporarily changing your computer's system date to an earlier year (e.g., 2016) before entering the code. Once the game accepts the key, you can typically revert your clock to the current time. drug wars underworld registration key
The registration key, also known as a product key or CD key, is a unique code required to activate and play the game. The key is usually found on the game's packaging, in the manual, or on a sticker on the game disc. The original mechanics are not copyrighted