When an image obtained with use of a digital camera is deleted, deletion information including time and date of photography thereof is generated and recorded in a memory card. The objects of the invention provide industrial solutions that, while introducing a considerable reduction in environmental impact in their preparation and use, provide better health conditions for the professionals who work in the tire bonding industry. The decoder includes several Galois field multiply accumulators, and a state machine which controls the Galois field units. The user equipment requests bearer establishment from the data packet network and marks bearer establishment packets with said session identifier.