Abstract: In order to fulfill the requirements in terms of biological compatibility and mechanical stability, a transponder-holding case is provided as implant in animal breeding and keeping, which case consists of a first case section and a second case section made of a biologically compatible synthetic material, with the two case sections being designed for being detachably fastened at one another, preferably through a self-sealing and self-locking threaded joint, so as to form a hermetically sealed holding space for a transponder to be received therein. For an improvement of the position-retaining function in the animal body at least one of the case sections presents at least one formed-in portion on ist outside, and at least on the outside of one case section a receiving area is provided for a preferably laser-engraved identifier mark.

Abstract: A method of protecting programs and data in computers against unauthorized access and modifications employs a programmable hardware circuit to monitor memory regions of a computer. The memory regions are divided into different access levels, and the circuit is programmed to permit access only to predetermined regions. If an unauthorized access is attempted by a program, an address corresponding to the program location initiating the unauthorized access is detected and the program is stopped. This ensures that the procedures for protecting the operating system cannot be circumvented to gain unauthorized access to data of any type. After programming of the circuit is completed, the programming cannot be changed except by actuation of a hardware switch or by re-starting the computer. Removal of the circuit will cause short circuits, thus making it impossible to shut the circuit off without being detected.