hagitm:
The law is very clear on that matter:
The idea (creating a certain type of puzzle) is not copyright protected. The content of is.
In other words, everyone can create their own griddler/sudoku/kakuro/straights etc. It is forbidden to take a ready product (images, solved puzzles/solutions).
As for the mechanism - if you meant the software to create those puzzles - we have our own product. It is not flawless, if you followed the forum, but thanks to our users we fix the bugs they find.
Hagit
I think, my remark has been missunderstood. You can of course create as many puzzles as you want from any type. But with a view to Str8ts/Streights
it is the question, which name to be used.
It is difficult to describe for me, I hope my example will make it easier to understand:
If I produce a brown lemonade, which tastes like Coca-Cola, and I want to sell it in red cans with the product-name "Cocaa-Colaa", I'll get also a problem. That is, what I mean.