That is bad news DPD1
I hope you can ride it out.
There are always people wanting to copy good ideas. It would be nice if they bought your products from you!
I have heard that people often take a new product into Walmart, the buyer says that's great, leave me a sample and get back to me in a few months. When the seller gets back to them in a few months the buyer says, yeah they are great we have a container arriving next week from China !
I don't know how guys that do that can sleep at night!