What are the limitations of using PHP code for copyright protection in modules or add-ons?

Using PHP code for copyright protection in modules or add-ons is not foolproof as it can be easily removed or bypassed by experienced developers. To enhance copyright protection, consider using a combination of legal measures such as licensing agreements and digital rights management tools. Additionally, implementing obfuscation techniques in your PHP code can make it more difficult for unauthorized users to access or modify your code.

// Example of obfuscating PHP code to enhance copyright protection
function obfuscate_code($code) {
    $obfuscated_code = base64_encode($code);
    return $obfuscated_code;
}

$original_code = "Your PHP code here";
$obfuscated_code = obfuscate_code($original_code);

// To decode the obfuscated code
$decoded_code = base64_decode($obfuscated_code);
eval($decoded_code);