The other day i was looking for a way to encode my php scripts, in my search, i found three choices:
1. Zend Guardâ„¢ is available for $995 USD as a yearly subscription license.
2. Ioncube PHP Encoder: Starts at $199 USD
3. SourceCop : $30 USD
4. SourceGuardianâ„¢ : $250 USD
5. Turck MMCache: FREE [download at sourceforge]
Ofcourse, you pay for what you get. If I could afford it, I would go with Zend.