Serial number is that some software has taken certain protection measures to prevent piracy. When a user registers, a unique identification code will be generated according to the computer software and hardware information installed by the user's software, which is generally called machine code, also called serial number, authentication code, registration application code, etc.
The registration machine is a program that calculates the registration code through an algorithm for a certain software. When we write the registration machine, we generally need to know the algorithm of the registration code (this is of course learned through tracking and debugging), and then use assembly language or other high-level languages to restore the algorithm. In this way, everyone can enter the registration code according to their own requirements, such as registering according to their own name and company name.
Strictly speaking, the version of cracked code is not an authorized version, because it is a special version formed by secondary development of software with limited use, such as commercial version, trial version, shared version, etc. That is to say, users can use all the functions of the software without any economic cost. Generally, it is realized by rewriting the original software, making a digital counter and intercepting the registration information.