While in college I created a product in one of my sponsored design studios that I later presneted and "sold" (never received any money for the sales) at the sponsor's store as part of my class assignment. This was in December of 2015. Two years after this an opportunity came up where I could present my product to a distributor. After presenting and speaking with the distributor over the last couple of months I have seen an increased interest from them to potentially license the product from me. They have asked for some samples in the upcoming months which I'm in the process of creating. However this has made me realize that I need to try and protect my idea in some way.
Therefore I am wondering if there is any way that I can protect my idea since it has been nearly 2 years since public disclosure? Or if presenting it in such way even counts as public disclosure?
Any help is appreciated.