Write down everything about it and make sure that you date it. Then put the idea and write stuff you can about it and date it make copies of it (put it in a file cabinet or someplace) put the original one that you wrote in an envelope, seal it, make it out to yourself(to be mailed to you.) Take it to the post office and tell them to postmark it and drop it in the mail slot, to be mailed to yourself. When you receive it it the mail at your house, DO NOT OPEN IT! Make sure you put it up in a safe place. This is what they call a poor man's patent. And it's legit if nobody else has documentation of it dated after yours. If you have to go to court over it for some reason, all you have to do is take the sealed letter to court with you and let them open it. Maybe you should mail more than one copy of it to yourself at the same time, just to have them. In seperate envelopes of course.