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I think you're talking about a patent. My understanding is that you can only apply for a patent before your idea becomes public knowledge, because after that point it's essentially a "free" idea at nobody can claim ownership of.
Patenting something is also fairly time consuming and expensive, and they expire after a while. So as a private individual it's only really worth pursuing if you think your idea is going to make bank.
This is super cool btw!
Great stuff - can you apply for copyright / intellectual rights / design (or whatever they call it on dragon's den) so that no-one nicks your ideas?