How to copy protect a flash file?

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
A text driven memory game is in the process of being developed.
The game is developed in flash, and shall be downloadable to the customer.
What are my options that prevent the customer from copying that game and passing it on to ‘friends’?

I am not looking for any program code here, all I want is information.
Is is possible?
What are my options?
What are the keywords I should look out for?

Skills required:
Adobe Flash
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