If you are in the software development industry, perhaps a common shareware programmer, or an engineering manager, you need to protect your software. In order to prevent their software from being cracked or illegally used, all software developers will take various measures to protect their software. One of the most commonly used methods is the software registration mechanism.

As software development companies, their biggest concern is that their software will be decompiled/cracked soon after it is launched, so many developers choose to pack/encrypt their software products. In general, the file size of packed software is smaller, and the program itself becomes more secure. These days, packer has been moving towards virtual machine protection technology, whose greatest benefit is that it can greatly improve the protection strength. Packers employing this technology include Themida, WinLicense, EXECryptor, etc.; While the downside is that it affects the startup and running speeds of program, so it's not suitable for every situation.