I'm making a distributable DLL plugin for a program I currently use that hosts an API to expand it's functionality. I want to use MySQL in this plugin but I don't want some 10 year old decompiling my plugin and getting my source code.

How can I make sure that the credentials I use for the application will not be compromised? The username and password will only be good for the certain tasks of the app but I still don't want it seen.