It sounds like you’re referencing the Paxton Net2 access control system and looking for information about its SQL database password, specifically the exclusive user account.
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Paxton Access\Net2\SQL
This change was explicitly made to prevent malware or malicious insiders from using a known default password to extract the access control database. Hence, the password became exclusive to each deployment. paxton net2 sql database password exclusive