Um... What about creating a routine that checks if the keyboard is attached to your user's computer and send out the zapping current so that the keyboard won't work anymore???
Nope... As long as somebody can see, they are potentially theirs to take...
Not from Flash, not from HTML or whatsoever... At least that's what I know... Do you know ANY working environment that supports the secure system???
The only option... Hm... Post some low resolution artwork probably region by region??? Other than that??? Not a clue...