[nl]

Note that isn't part of the rules. It's part of the "Winning submission documentation requirements" which is a separate document and wasn't mentioned at all on the "external data" Kaggle thread, which had Kaggle moderators explaining the rules.

Documentation requirements are pretty standard in Kaggle competitions, and usually cover having to supply your code, and maybe write a blog post about it. I've never seen one that had major rules in it.