(Now legacy) Previously a major competitor to ionCube.

SourceCop is a specialized security application for PHP developers that aims to prevent unauthorized copying and redistribution of their scripts by converting human-readable code into an unreadable, encrypted format. Key Security Features Source Code Encryption:

If you need to protect your PHP source code, it is recommended to use modern, officially supported, and secure tools:

A version with all features unlocked (often bypassing the original licensing system). Security Warning