does anyone know where to get old Software Source codes like for instance I would do anything to see the source code of Aim

Question

question about obsolete software Source codes

Answer 1

that's what I thought but what I don't understand is how people like Norton Antivirus you're able to obtain source code for all computer viruses and stuff and how did they do that I don't understand because it's not exactly open-source you know what I mean but somehow they're still able to obtain it got stuxnet source code