I believe a website called the-pirate-bay, and I got a key generator? I think that’s what it’s called. One of those majiggers that gives you a product code. But it was something like three years ago that I got it, so I’m fuzzy on the details. I have an actual legal copy that my dad got on a grant for work, but it’s for Windows only and I’m a Mac girl (sigh).
I use a totally legal (“totally legal”) version of CS4.