A stationary short-range wireless communication device, SRWCD, acting as a node (12; 14) of a network in which nodes (12, 14, 16) are isolated from each other, the stationary short-range wireless communication device comprising: a short-range communication unit, SRCU, for short-range communication with at least one mobile wireless device, WD, and configured to detect the mobile wireless device being in the vicinity of the node (12; 14), a node data memory, NDM, provided for node data, ND, relating to at least one other node of the network, wherein the node data memory comprises the node data, ND, intended for the at least one other node (14; 12) and user data, UD, intended for a user of the mobile wireless device, a node control unit, NCU, configured to control transfer of data between the stationary short-range wireless communication device and the mobile wireless device, which transfer comprises the transfer of the node data, ND, in order to enable the mobile wireless device to transport the node data, ND, between the node (12; 14) and the at least one other node (14; 12) of the network, wherein the node control unit, when controlling the transfer of data, is configured to control the transfer of the node data, ND, in the node data memory to the mobile wireless device in order to be transported to the at least one other node (14; 12) and is configured to also transfer the user data, UD, to the mobile wireless device, and an access limitation providing unit, ALPU, configured to provide an access limitation to the user data, UD, at least a part of which can only be removed when the node data, ND, has been delivered to the at least one other node (14; 12) of the network, wherein the access limitation providing unit, ALPU, is configured to encrypt the user data, UD, using at least part of the node data, ND. a short-range communication unit, SRCU, for short-range communication with at least one mobile wireless device, WD, and configured to detect the mobile wireless device being in the vicinity of the node (12; 14), a node data memory, NDM, provided for node data, ND, relating to at least one other node of the network, wherein the node data memory comprises the node data, ND, intended for the at least one other node (14; 12) and user data, UD, intended for a user of the mobile wireless device, a node control unit, NCU, configured to control transfer of data between the stationary short-range wireless communication device and the mobile wireless device, which transfer comprises the transfer of the node data, ND, in order to enable the mobile wireless device to transport the node data, ND, between the node (12; 14) and the at least one other node (14; 12) of the network, wherein the node control unit, when controlling the transfer of data, is configured to control the transfer of the node data, ND, in the node data memory to the mobile wireless device in order to be transported to the at least one other node (14; 12) and is configured to also transfer the user data, UD, to the mobile wireless device, and an access limitation providing unit, ALPU, configured to provide an access limitation to the user data, UD, at least a part of which can only be removed when the node data, ND, has been delivered to the at least one other node (14; 12) of the network, wherein the access limitation providing unit, ALPU, is configured to encrypt the user data, UD, using at least part of the node data, ND.