While there may be registration key generators available for download, such activity is illegal and constitutes copyright infringement. Software piracy includes the manufacturing or distribution of unauthorized serial numbers.
A registration key is required to activate a StopZilla product. A registration key is provided by the software company upon receipt of payment for its product. Stopzilla offers free trial periods for all of its software. After the trial, the user must purchase the program to continue using it.
Using an illegal key generator is subject to legal ramifications as theft and can leave the user's computer vulnerable to attack. There are many completely free antivirus programs available as an alternative to using a key generator.