[PHP] Ethics question...

[Shane McBride]

I have spent a lot of time working on a specific E-Commerce (shopping-cart) to fill a 
need for a customer. Now that the project is complete, I would like to market the 
product, which is entirely PHP and MySQL.

My question is: Is it ethical to sell a product ( at a relatively low-cost) written in 
PHP, especially since this group made it possible?

If that's ok to do, does anyone have any ideas how I can put a time limit on a demo 
that isn't easily defeated?


TIA,
Shane