Stolen Goods
Stolen goods is a term for a cargo canister collected by someone other than its owner. Most canisters that can be collected using the ship's cargo scoop in space are considered stolen.
Note - If you have not personally purchased the goods in your cargo hold from a market then there's a good chance it will be seen as stolen property because it initially belonged to someone else.
The status of cargo another ship is carrying can be verified by using a Cargo Scanner on a targeted ship and then viewing the CARGO menu in the left hand screen of your own ship. If cargo scanned while carrying stolen goods, a bounty will be incurred. Stolen goods may be sold at any station offering a Black Market in the Contacts menu of Starport Services.
Carrying stolen goods can be a dangerous pastime. Authorities, and other players, will often scan ship's cargo to see if they are carrying any stolen goods.