When I restore my Time Machine backup to a new Mac, will my licenses still be legal?

I had a lot of licensed applications on my old Mac. When I got a new Mac I restored the whole thing from a Time Machine backup. All the applications is of course working, and I don’t need to verify or enter any serials for the new computer. Do I have the legal rights to keep using these? What if I keep using my old computer in addition to the new one? Where’s the line here folks?