A regional lockout is a class of digital rights management preventing the use of a certain product or service, such as multimedia or a hardware device, outside a certain region or territory. A regional lockout may be enforced through physical means, through technological means such as detecting the user's IP address or using an identifying code, or through unintentional means introduced by devices only supporting certain regional technologies.

A grey market or dark market is the trade of a commodity through distribution channels that are not authorized by the original manufacturer or trade mark proprietor. Grey market products are products traded outside the authorized manufacturer's channel.