Protection curiosity

Most of the new games I see backed up need one form of crack or another to run, even if they have been burned with one of those programs that retain the copy protection.

Why isn’t it possible to just do a bit-by-bit copy of a cd, along with whatever sector errors, file system weirdness and so on that make up the protection method?

can anyone tell me how i can find the cd crack for path of neo , i downloaded from the internet but when i tried to play it it says that can find the original cd or dvd , i apreciate if anyone knows how to do it . thankss