I have created a plugin for WordPress although I would like to encrypt it to stop people viewing the source code. I've heard of Zend Guard and IonCube although is there a free alternative to these? Thanks for the help. :)
The only way to really protect your php-applications from other, is to not share the source code. If you post you code somewhere online, or send it to you customers by some medium, other people than you have access to the code. You could add an unique watermark to every single copy of your code.
Yes, you can definitely hide/encode/encrypt the php source code and 'others' can install it on their machine.
With PHP Obfuscator, no complete illegibility of the source code can be achieved, since the PHP server must be still able to process the script - even without additional software installed on the server. For proper processing of the script, the full source code or the entire file (including HTML tags) should be pasted.
Try this one: PHP Encoder
This might be the answer you are looking for.
Looks like the things you choose are not working this way:
If you don't want to share the source, provide the code as a service. You may require the user to enter API key etc.
See: SaaS
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