How about this: 1) Describe a system similar to the patent that is compatible with chunked-HTTP downloading from multiple mirror sites ( which has been around

How about this: 1) Describe a system similar to the patent that is compatible with chunked-HTTP downloading from multiple mirror sites ( which has been around since before the patent ) 2) Ask for declaratory judgement that such a system does not infringe on the patent 3) The troll will fight back, let them 'win', i.e. make them prove the system you describe is the same as their patent 4) Reveal the system is prior art => invalidate the patent 5) Profit? EDIT: IANAL, but just thinking out loud....