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Ok for multiple logins I use iprotect. Its compiled into apache so it has no performance penalties like I experienced in pennywize (early versions)
To prevent leaching I use a simple little cgi script that checks the referrer and loads the files to the browser. Unfortunately if someone wants to leach it is possible. I have much experience in leaching because if you want to protect your site you have to be an expert at it to see what is necessary. However it is possible to prevent it when normal joe is doing it. I will not disclose how you can leach every site of obvious reasons but you can only protect against it if you crypt every link and run it through a database which is so much damn work that normal people wouldn't even consider it.
It seems Flash is relatively well protected from leachers but I haven't checked out the latest offline browser generations.
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