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Any one tell me about bpf ?

I know bpf is receive copy received packet from data link layer.
and bpf is receive copy of transmitted packet.
I knew bpf is receive copy!.
So, I understand work of snort.
But, I can't understand about pf(for protect).
I think bpf is receive only copy. original is transfer!
Is this think is wrong?
Any one tell me How pf is protect the packet!
ps)I am not familier english. I am sorry!(for my expression!)