Protecing your investment is a difficult one when it comes to writing software, even just normal desktop apps never mind web applications!
I’ve heard about and even seen in operation this solution:
http://www.ioncube.com/
From what i’ve heard, its uncrackable! Great!
Its possible to sell php scripts and not worry about people ripping off your source code and re-selling it, it can be tied down to only run on a paticular ip or even mac address.
If i sell a product, this is what i would use, definetly, or a similar product that is just as protected.
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