Write the number down and save it carefully if you have to do it again.

I'm constantly irritated by MS checking I'm not pirating them when they pirated me in copyrighting work I placed in the public domain in 1968 on bit-mapped fonts, and the oneperday.com utility I placed in the public domain in the 1980s, taking an 8-byte machine code routine and inflating it to over 100k w
of sheer noise. I know it was based on my routine as I put a 1-bit null marker in at a particular point just to detect piracy, and it's there in Microsoft's routine. It's a function which checks the date of an executable file and if it's before today's date, runs it, resetting the daye to today's: if it's today's, it stops. They named it something else, don't recall what, and if they object to my reverse engineering their code, I didn't: I bit-searched theirs using the code I wrote and used the old Windows 3 code editor on the section it found. But you try suing them!