I looking a software to encrypt source code. Below links is popular php encoder
I recommend
Zend Guard or
ionCube PHP Encoder because they are market player
PHP encoderZend Guard - $995 - Annual
ionCube PHP Encoder $199 - $348SourceGuardian $250 - $450
CodeLock $35 USD one-time payment
Which one is for me?Visit
encodercompare.com How it work?Most encoder software use
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Obfuscation -
Compiler to native code or byte code
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Encryption