The advantage of this is that you can sign and install software, themes, fonts or virtual keyboards that require certificate signing. Disadvantages are not disadvantages, but with the certificate, there are still many troubles, such as how to sign the certificate with what key, how to keep the certificate, what to do if it is damaged, and what to do if it expires. The solution is to use the certificate-free signing tool: "direct signing tool", which can directly sign SIS or SIXX anytime and anywhere without registration application.