Are there any best practices for protecting PHP source code from illegal duplication when it is hosted on a client's server?

Protecting PHP source code from illegal duplication on a client's server can be challenging, but one effective way to do so is by using a license key system. By generating a unique license key for each client and validating it within the PHP code, you can prevent unauthorized duplication of your code. 

// Example of implementing a license key system
$license_key = 'YOUR_LICENSE_KEY';

// Validate the license key
function validate_license_key($key) {
    // Add your validation logic here
    if ($key === $license_key) {
        return true;
    } else {
        return false;
    }
}

// Check if the license key is valid
if (!validate_license_key($_GET['key'])) {
    die('Invalid license key');
}

Keywords

obfuscation encryption licensing ionCube source code protection

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