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As mentioned several times, ZendGuard is a dumb idea. It won't even work with PHP>5.2, and it's very hackish, and easy to decrypt. ionCube takes a bit more work, but if you're trying to keep it your own intellectual property, your best bet, as mentioned, is to encode the licensing bit, and ensure it uses an external call to your own servers every so often for an update.
Sure, if it's as simple as a 'return true/false', it's not gonna be hard to mess with, but if you make it a bit more inline for functionality, it'll likely be worth their time to just buy it rather than steal it.
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