Content distribution system

A networked computer system comprising:

• a central server at a root node of the networked computer system;
• a plurality of store servers that are intermediate nodes of the networked computer system, the store servers including a first store server communicating with the central server over a first network and a second store server communicating with the central server over the first network;
• a plurality of first receipt issuing devices that are leaf nodes of the networked computer system, the first receipt issuing devices communicating with the first store server over a first local network;
• and
• a plurality of second receipt issuing devices that are also leaf nodes of the networked computer system, the second receipt issuing devices communicating with the second store server over a second local network, wherein
• the central server is configured to
• store content information that associates:
• store codes for identifying stores corresponding to the store servers,
• device codes for identifying the first and second receipt issuing devices, and
• print specifications of the first and second receipt issuing devices, and
• according to the print specifications, generate content that is to be added to receipts issued by the first and second receipt issuing devices,
• a first control plane is implemented at the root node to control whether or not the content is to be distributed to the first store server and whether or not the content is to be distributed to the second store server based on the stored content information, and
• a second control plane is implemented at each of the intermediate nodes, the second control plane implemented at the first store server controlling whether or not the content is to be distributed to the first receipt issuing devices and the second control plane implemented at the second store server controlling whether or not the content is to be distributed to the second receipt issuing devices.