Sectigo Code Signing certificates are employed to digitally sign software and application programs. This action lets the certificate authority verify the source of the file and, it lets the end user know that the source code has not been altered in any way. The scenario where such certificates become a necessity are where the publishers distribute their software through the third-party download sites. The thing with third-party sites is publishers may or may not have control over such sites. Most of the major operating systems show an error message to the end-users if the software they are trying to install is not signed by a trusted CA.