Hikari, need to distinguish the difference between concept and design. The concepts used in both the White Water and the Cascade have been around for a very long time (~25yrs for the White Water, and ~60yrs for the Cascade). The actual designs themselves of the two blocks are actually fairly unique, as in one couldn't exactly point to any other design that looks just like them. Similar in certain ways, yes. The same, no.
Not that I particularly care any more. I find it amusing watching the jostling that goes on, with claims to "perfect", "best", and "our clone is better than competitor X's clone". I am not interested in arguing with anyone over who owns what design. It's all pointless. I can only say that people reap what they sow.
Best of luck in your "endeavors".
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