That's all very nice Douglas, but sometimes you cant hide everything. Sure it's easy to put away the most secret and newly developing technologies. A clever person doesn't need a blueprint. just a piece of the puzzle will do. Perhaps that missing piece to his puzzle is something you think so common or insignificant that you don't even think to hide it. I hear of this happening when companies have a good customer who does a few million a year for them and they get a walk through of the facility while on a buying trip. There's lots of examples. Now days when I go to Europe it's all but impossible to be let on a factory floor.
Your open door policy is very noble, but this policy will change when your home business get larger.