A method for distributing multimedia licenses (LIR, LIS) by a server to a plurality of user devices in a distribution system of a multimedia service, access to which is protected by a first protection corresponding to a first transmission key generated by the server, according to a distribution regular mode implemented by the server, said server being equipped with computing resources allowing, at an instantaneous pace (Dinst) proportional to the computing resources used and up to a limit of a maximum pace (Dmax) defined by a maximum use of said resources, generating regular licenses in response to requests coming from said user devices, each regular license comprising said first protection, access to which is secured by a specific protection (Kp) corresponding to a personal key and associated with each user device, and different for each user device, said method comprising the following circular steps: - verifying whether said instantaneous pace (Dinst) is less than the maximum pace (Dmax) and, - if so, generating then transmiting to the user device said regular licenses in response to each of said requests, - if not, switching the server into a singular mode of distribution capable of distributing as many multimedia licenses (LIR, LIS) as necessary and consisting of: - protecting access to said multimedia service by at least one second, additional protection, corresponding to a second transmission key, independent of said first protection, - generating in the server at least one singular license comprising said second protection said singular license being a simplified personal singular license, in which case the generation of said singular license is accomplished by means of a simplified algorithm requiring a reduced number of cryptographic operations, or a singular license shared by a plurality of user devices, - transmitting said singular license to at least a part of the user devices, so that if said singular license is a singular license shared by a plurality of user devices, said singular license is shared by all the user devices which are pending receipt of a regular license or by a particular group of user devices, i.e. by a part of the set of user devices pending receipt of their regular license, - verifying repetitively whether the instantaneous pace (Dinst) is less than the maximum pace (Dmax) and if so, switching from the singular mode to the regular mode to allow access to said multimedia service only by means of a regular license. - verifying whether said instantaneous pace (Dinst) is less than the maximum pace (Dmax) and, - if so, generating then transmiting to the user device said regular licenses in response to each of said requests, - if not, switching the server into a singular mode of distribution capable of distributing as many multimedia licenses (LIR, LIS) as necessary and consisting of: - protecting access to said multimedia service by at least one second, additional protection, corresponding to a second transmission key, independent of said first protection, - generating in the server at least one singular license comprising said second protection said singular license being a simplified personal singular license, in which case the generation of said singular license is accomplished by means of a simplified algorithm requiring a reduced number of cryptographic operations, or a singular license shared by a plurality of user devices, - transmitting said singular license to at least a part of the user devices, so that if said singular license is a singular license shared by a plurality of user devices, said singular license is shared by all the user devices which are pending receipt of a regular license or by a particular group of user devices, i.e. by a part of the set of user devices pending receipt of their regular license, - verifying repetitively whether the instantaneous pace (Dinst) is less than the maximum pace (Dmax) and if so, switching from the singular mode to the regular mode to allow access to said multimedia service only by means of a regular license. - protecting access to said multimedia service by at least one second, additional protection, corresponding to a second transmission key, independent of said first protection, - generating in the server at least one singular license comprising said second protection said singular license being a simplified personal singular license, in which case the generation of said singular license is accomplished by means of a simplified algorithm requiring a reduced number of cryptographic operations, or a singular license shared by a plurality of user devices, - transmitting said singular license to at least a part of the user devices, so that if said singular license is a singular license shared by a plurality of user devices, said singular license is shared by all the user devices which are pending receipt of a regular license or by a particular group of user devices, i.e. by a part of the set of user devices pending receipt of their regular license, - verifying repetitively whether the instantaneous pace (Dinst) is less than the maximum pace (Dmax) and if so, switching from the singular mode to the regular mode to allow access to said multimedia service only by means of a regular license.