[e9]

I was learning OS stuff and made a toy virus for myself back in 1999 and I thought it would be cool if antivirus officially recognized it so I sent a copy to antivirus company(Dr.Web. I think it was called?) and to my surprise now all antivirus databases have it and someone even has gif recording of machine booting up with it… so clearly they must be sharing not just db but also the executables etc

[tedivm]

There are sharing programs between companies, yes, but that isn't what we're talking about here.