A tape seal includes electronic circuitry to detect tamper- and manipulation events relating to sealed items in various embodiments. A complex impedance is formed in a continuous seal. The seal is designed in such a way, that any attempt to break or remove the seal results in a change of the complex...http://www.google.fr/patents/US7772974?utm_source=gb-gplus-shareBrevet US7772974 - Tamper evident seal system and method
