He can't, it's already a patented concept, but he has copyright on the assembly, as a whole.
Out of all the waterblocks out there, they can generally be categorized: ~flat-plate (Swiftech), labyrinth (Maze, Spiral), etc...
We're at a point where some of these concepts have to be combined, in order to get more performance. In other words, you're not going to be able to tweak a Maze3 to get a couple more degrees, without adding something to it (fins, jet,...).
Cathar successfully combined a fast flow (not quite jet) and micro-fin.
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