Abstract: A charging system for electrical aircraft includes multiple charging drones distributed in an airspace. A respective charging drone is configured so as to be operated with a first type of fuel, wherein the respective charging drone carries a supply of a second type of fuel. The respective charging drone includes an energy converter, which is configured so as to provide from the supply of the second type of fuel an electrical power to be transmitted to an electrical aircraft located in the airspace. The charging system is configured so as to identify among the charging drones located in the airspace the one which demonstrates optimal criteria for the electrical aircraft and to prompt this charging drone to proceed to the electrical aircraft, carry out a charging operation, and fly back to its waiting position.

Abstract: A method for providing content associated with a digital watermark on a mobile telecommunication device. The method includes coupling the mobile telecommunication device with a radio module integrated into an accessory mountable to the mobile telecommunication device and associated with the digital watermark. The digital watermark is a cryptographically unique and indivisible digital watermark. The method includes reading the digital watermark from the accessory and providing content associated with the digital watermark on the mobile telecommunication device. Further provided is an accessory for a mobile telecommunication device, which accessory includes a radio module associated with a digital watermark.

Abstract: A method for time-controlled release of at least one function of an apparatus. The method includes providing a non-fungible token to a mobile device, wherein the non-fungible token contains key information for the time-controlled release of the function of an apparatus, extracting the key information from the provided non-fungible token by way of the mobile device, generating a digital key based on the extracted key information, transmitting the digital key from the mobile device to the apparatus, and checking the transmitted digital key by the apparatus. The function of the apparatus is released upon successful checking.

Abstract: A personal virtual agent for journey planning for a user of a vehicle, having a central processing unit, a user interface device for communication with at least one user-specific information memory, a vehicle interface device for communication with at least one vehicle-specific information memory, and a route interface device for communication with at least one information memory for routes. The central processing unit is embodied to take into consideration information from the user-specific information memory and/or information from the vehicle-specific information memory (to receive at least one route from the information memory for routes, and to take into consideration the information from the user-specific information memory and the information from the vehicle-specific information memory to select a route.