i have been on this since quite sometime now , and have realized , the only way is to have something as the abobe flash stream server or something like that. my company has paid flash content on the www and its really difficult to protect the files actually. load any flash content and go to ur temp folder, the .swf file will be there! however there is a /nocache switch which can be used when u are creating the flash/swf file which will prevent caching, but again there are plenty of 3rd party tools out there that do the same. not to brag here, but i was also checking various security for my company website and in the end, i just let it be. I went to this another site which had the flash file encrypted code and referenced and what not. It took a software 5 seconds, yes 5 seconds to find its existence and rip it off. I will be looking into this further today and next week. Will post back here if I find something really worthwhile.