IT device is a hardware system which has special processor and interface modules for it's own function and performance. For a brand new product development, programmer are looking for finding new interface modules to save time making driver algorithm. In that case, the program used for this modules are the same as others product one. So it can't be copyright on the software. On property right verification of these system, there could be a mis-result when they have open source and general known program code by a interface module company. We show the guideline to keep the property right of owner on the module interface and communication interface, IO interface whether it has open source or not.