Serial Generator Mount & Blade What Is All That Serial Generator Stuff?

What is all that serial generator stuff? - serial generator mount & blade

I told my friend who have bought computer savvy, Photoshop CS3, and this gave me strangely and told me that I could save a lot of money and just use a torrent or generator serial number. I know that torrents are illegal, but what is the generator serial number of things? Is it legal? Is it safe for these serial numbers, even if the generator itself is free of malware? What are the dangers?

So, let me know if it's illegal, but because I want to stay within the law, even on the computer.