Method for electronically documenting licence information regarding granting of a licence and regarding use of this licence in a network of a plurality of electronic data-processing apparatuses that can be interconnected in a data-transferring manner, wherein the licence information is managed in a decentralised transaction database using blockchain technology, wherein the transaction database contains a chain of transaction blocks (19, 20), and wherein new licence information can be added to the transaction database in new transaction blocks by means of a block-generating method, wherein, in the block-generating method, - first, a piece of output-block information generated using information regarding a preceding transaction block from the transaction database and an integrity criterion for the addition of the new transaction block to the transaction database are obtained from the network, wherein, - subsequently, a new transaction block is generated which fulfils the integrity criterion and contains the at least one piece of output-block information, the new licence information and a piece of integrity information, and wherein, - finally, the new transaction block is added to the transaction database, wherein, when granting a licence to a licensee, a licenser generates a new piece of licence information with a licence-granting entry, which is added to the transaction database in a new transaction block using the block-generating method, wherein the licence-granting entry contains at least one licence identifier, characterised in that, before, during or after use of the licence granted by the licenser, the licensee generates a new piece of licence information with a licence-use entry, which is added to the transaction database in a new transaction block using the block-generating method, wherein the licence-use entry contains at least the license identifier of the licence-granting entry and a use identifier, in that the licence-use entry contains a piece of licence-use information and in that the licence-use information contains a unique use serial number in the licence-use entry. - first, a piece of output-block information generated using information regarding a preceding transaction block from the transaction database and an integrity criterion for the addition of the new transaction block to the transaction database are obtained from the network, wherein, - subsequently, a new transaction block is generated which fulfils the integrity criterion and contains the at least one piece of output-block information, the new licence information and a piece of integrity information, and wherein, - finally, the new transaction block is added to the transaction database, wherein, when granting a licence to a licensee, a licenser generates a new piece of licence information with a licence-granting entry, which is added to the transaction database in a new transaction block using the block-generating method, wherein the licence-granting entry contains at least one licence identifier, characterised in that, before, during or after use of the licence granted by the licenser, the licensee generates a new piece of licence information with a licence-use entry, which is added to the transaction database in a new transaction block using the block-generating method, wherein the licence-use entry contains at least the license identifier of the licence-granting entry and a use identifier, in that the licence-use entry contains a piece of licence-use information and in that the licence-use information contains a unique use serial number in the licence-use entry.