Control of access to an on-line service via a Li-Fi network

A method for controlling access to an online service, the access to the service being requested, via a communication network, by a terminal suitable for receiving data broadcast by a plurality of data transmission devices, said devices producing a beam of light, said data broadcast being implemented by a modulation of said produced light beam, wherein:

• each transmission device is characterized by a unique identifier,
• each transmission device belongs to a group of devices,
• and wherein a server connected to the transmission devices implements:
• upon receiving a request from the terminal to access the service via a second transmission device from the plurality of data transmission devices identified by a second identifier, verifying whether a previous access request for the same terminal was accepted for a first transmission device from the plurality of data transmission devices identified by a first identifier,
• when the first and second identifiers correspond to devices of the same group, processing the access request by accepting the access request, and
• when the first and second identifiers do not correspond to devices of the same group, not processing the access request.