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Maybe he's using Paypal's IPN (Instant Payment Notification) system, to only send out the sourcecode when the user has paid the correct amount.

What do you mean by "hackable price"? One can easily download the source code of course... He did wrap it in a frame or something to make it somewhat nontrivial.

I believe he is referring to this snippet in the source code:

PayPal IPN solves this by returning the transaction data to whatever IPN URL that you specify. You can then verify that the correct amount was paid.

Yes I know that. If I ll receive less payment, I ll not send the code. Your application is cool!! keep up good work. Thank for the link!!