AUD...the old way to protect your Idea was to , write everything down about your Idea include pictures,drawlings,and any thing else that proves its YOUR idea..Then take it to a NOTERY public and have them witness all the paper work and stamp it, next put in a envelope and mail it to yourself,when you recive it do not open it  put away in  safe place.. at this time this will allow you to then show it to others and try to sell your Idea..if anybody tries to take it or steal it ..you can prove in front of witnesses when you open the envelope and alllow them to read it ..if things come to this open it in front of LAWYER..TO do this willl only cost you a few dollars and give you some protection....