How to protect flash files?

I wanna put some of my swf files on my personal page, but how do I prevent people from copying it by viewing the source and typing like mysite.com/flashfile.swf?

I saw sites that do that... Only thing I know about protection is how to prevent hotlinking of images...

The site is on a subdomain so I would only need protection for that subdomain...

Any help would be throughly appreciated. Thank you so much.

 

 

 

 

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