Definition
A system that requires government permission before certain goods and technology leave the country. It looks not only at what is being sent, but also at who will receive it, where it is going, and what it will be used for. It catches shipments at a different point than a system that sets the amount allowed out in advance.
Same machine, different answers depending on where it goes
Say you want to sell a precision machine tool overseas. That machine can cut car parts. It can also help make weapons. It's one product with two possible uses. Items like this are called dual-use items.
So many countries put a service window at the door. Before an item can leave, its owner has to get a permit. The application doesn't list only the item's name. It also asks who the buyer is, which country it's going to, and what it will be used for there.
That's why the answer can change for the very same machine. A shipment to one place may get approved, and a shipment to another may not. The machine hasn't changed. The receiver and the use have.
Countries don't build the control list on their own. They agree on lists together, and each one copies them into its own laws. There isn't just one such group. Four separate groups cover conventional weapons, nuclear items, missiles, and chemical and biological items, and their members differ a little. On top of that, countries sometimes add items of their own. In Korea, the Foreign Trade Act calls items on these lists strategic items, and requires an export permit before they are sent out.
Even items not on the list can be caught
A list is hard to finish. When new technology appears, the list is slow to catch up. And some products land just under the performance limits written on the list.
So there's one more safeguard. Even if an item isn't on the list, you need a separate permit before sending it out if it could be used to make weapons of mass destruction, or could end up going that way. In Korea, this is called a situational permit (sanghwang heoga). It's a safeguard that looks at where something is likely to be used, not whether it's on the list.
There is also more than one kind of permit. One kind is applied for deal by deal. Another is granted in advance for set buyers and items over a set period. The second kind saves companies that repeat the same deal from applying every time.
What happens if you skip the window? Korea's Foreign Trade Act provides for criminal penalties, and it also lets authorities restrict that person's trade in strategic items for a period of time. Even before anyone finds out how the goods were used, sending them out without a permit is itself the problem.
To be more precise: how are they different from quotas, bans, and tariffs?
The one people mix up most is the export quota. An export quota puts a cap on how much can go out. Export controls don't set the amount in advance. Instead, each time something goes out, the window checks the receiver and the use before granting a permit.
The reasons differ too. A quota is set by looking at prices or domestic supply. If you limit what goes out, goods stay in warehouses at home. Export controls are set by looking at what the item will be used for and whose hands it will reach.
It also has to be told apart from an export ban. A ban shuts the item out completely. Under export controls, an item can go out if it passes the window and gets a permit. A tariff works at a different level. A tariff adds a tax to the price and makes the goods more expensive. Export controls leave the price alone and decide whether the item can go out at all.
Looking at it from the trade-rules side, measures that block or restrict trade by means other than taxes are, in principle, prohibited. The rules name not only caps on quantity but also restrictions made through permits. So the difference we drew earlier wasn't about which one breaks the rules. It was about which method is used.
There is, however, a separate exception written in for security matters, such as the arms trade. This is the exception many countries point to as the basis for these systems. Exactly how far that exception reaches is still disputed, so we won't claim it's fine just because it sits in that spot.
Common misconceptions
Export controls let you send out goods only up to a set amount.
A cap on quantity is an export quota. Export controls don't set the amount in advance. Each time something goes out, a permit is granted after looking at what is going to whom.
Goods that aren't on the list can be exported without a permit.
Even if an item isn't on the list, a separate permit is needed if it could be used to make weapons of mass destruction, or could end up going that way. In Korea, this safeguard is called a situational permit (sanghwang heoga).
Where you meet it
When you sell a precision machine tool, you write down which factory it will sit in and what it will be used to cut, and you apply for a permit.
It's when the same part gets a permit for one buyer but not for another.
In one sentence
When certain goods and technology are sent abroad, the government sorts them by permit, based on who gets them and what they'll be used for.