[omnicognate]

Trivial and, presumably, illegal.

[zeroonetwothree]

How could it possibly be illegal? There is no IP protection for Date % words.length

[pseudalopex]

Copyright. Wardle and his partner chose the words.

[omnicognate]

That's what I'd expect, copyright on the word list. However, IANAL and I would love to see some proper analysis on the legal status of clones, especially identical ones with the same word list.

You can have a perfect clone of wordle running in a couple of minutes, but I'm certain that would be copyright infringement.

[heckerhut]

There is a copyright on databases for exactly that reason.