A blood broker is a company that pays people to sell their plasma to them and then they sell that plasma on the international market. They can either sell the plasma for research or to other companies.
Or, they make a deal with a fractionator to make a medication out of the plasma they have bought and then they try and sell that medication.
In the case of Canadian Plasma Resources, they plan to pay Canadians to sell their plasma, then send it to a laboratory in Texas (so it will leave Canada untested). Then, it will be shipped to Germany to a facility called Biotest AG, who will turn it into a medication and then try and sell it back to Canadian Blood Services.
There is no way for Health Canada to verify that it is, in fact, our Canadian plasma being used under a private model once it leaves our borders.