How to use bcompiler to encode PHP scripts?

I've made a PHP plugin I need to sell. Of course, I don't need people to modify the script and bypass license check. As Zend Guard is too expensive I'm trying to find an alternative. I just read about **bcompiler** but I don't know if it's efficient to encode entire script in a proprietary PHP application and how to use it...
How to use bcompiler to encode PHP scripts?
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I've made a PHP plugin I need to sell. Of course, I don't need people to modify the script and bypass license check. As Zend Guard is too expensive I'm trying to find an alternative. I just read about **bcompiler** but I don't know if it's efficient to encode entire script in a proprietary PHP application and how to use it...