For some prior art in this space, it may be useful looking at ESR's shipper: http://www.catb.org/esr/shipper/ http://www.catb.org/esr/shipper/ And some blog p

For some prior art in this space, it may be useful looking at ESR's shipper: http://www.catb.org/esr/shipper/ http://www.catb.org/esr/shipper/ And some blog posts he's written on it: http://esr.ibiblio.org/?s=shipper&submit=Search http://esr.ibiblio.org/?s=shipper&submit=Search