Hello Daniel, 
Most likely, we not absolutely understand each other. 
I would be very glad if there was an opportunity to add in PF feature which 
possesses IPTABLES.
On a gateway for a local network in rules of firewall it is possible to add a 
following line:
-A FORWARD -s 192.168.x.x -p tcp -m string --string ".mp3" -j DROP  
If the internal client of this network requests a resource with name containing 
".mp3" he will not receive the answer (www.mp3.com, www.music.com/Mozart.mp3, 
etc.).
Accordingly similar is possible to make with words "porno" "avi" and etc.
I do not consider that it is 100 % protection against uploading by users mp3 
files.
Certainly, there are ways for detour of similar interdictions created both by 
proxy-servers and by firewall. 
However in most cases this rule will be enough.


I do not see sense in the bet offered by you as there is a talk a little about 
other! 
Certainly, clever and talented person as you are will find a way to bypass 
interdiction!!! 

P.S. If for any reasons, it is not possible to do so, ⌠c'est la vie■

Best regards Alex



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