yes its possible, there would be no protection for such disclosure and there is no protection over an "idea". usually an "idea" isn't as important as how exactly it is carried out.
but can he patent my idea?
or are ideas open to everyone to copy?
the way he said it, he was going to patent my idea so that I couldn't implement it
well no, one cannot patent a concept or idea...a patentable invention must be a lot more detailed and thought out than than (assuming your idea was for something patentable in the first place)
also, it must be new/novel (i.e. not already patented)
and it must be patentable subject matter
no my idea was just for a website. It was a concept
it wasn't an invention
So botXXXXX XXXXXne he can't patent my idea and I'll still be able to pursue it?
that's right, an idea/concept for a website is not patentable
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