I have the idea of creating a some computer system. The principle of its work sounds similar to what two companies had already patented, nonetheless my idea is not completely analogous and some details of their patents are not well understood. I would like to ensure that my idea would not be an infringement of those patents, but without hiring a patent attorney or any lawyer. May I describe my idea for those both companies and ask them to send me some certificate confirms that I would never be sued by any of those companies? (assuming my idea doesn't infringes their patents) Is there a some risk that I would be sued even I describe my idea, but not develop it as program code? Thanks in advance!