This has me worried.

I have Spybot Home 2.6 installed on my one-month-old Windows 10 Laptop. It is not installed on any other product of mine.

I did have Spybot Home 2.4 on my old Windows Vista Laptop. However, it started giving problems and failed to work.
This saga is discussed in a previous thread.
That Laptop has not been used since installation of my new one.

I do have a Tablet, seldom used, and my wife has a mobile phone on which she uses Whats App. But Spybot is not on those.

So who these other 2 users are is a mystery and a concern to me. I would like more information.

As far as I am aware, I have one product and one license.

Oh, yes, I did tell my Firefox to allow the Spybot Forum cookie as suggested in another Forum Thread