It's just checking the url header and can probably be spoofed easily enough.
It was a minor protection to stop the rampant copying and posting to hundreds of Flash sites that would take people away from going to your site to play the game, where you might have some ad revenue on it. It became less popular to do that once libraries existed that could embed ads within the game itself.
I never did either, and didn't make any money off my Flash games (except a little money from a commissioned game, seems like a pittance nowadays) :/. Did help me get into the game industry professionally, though.
It was a minor protection to stop the rampant copying and posting to hundreds of Flash sites that would take people away from going to your site to play the game, where you might have some ad revenue on it. It became less popular to do that once libraries existed that could embed ads within the game itself.
I never did either, and didn't make any money off my Flash games (except a little money from a commissioned game, seems like a pittance nowadays) :/. Did help me get into the game industry professionally, though.