The ESD protective circuit according to the invention is designed for an electronic circuit which uses at least one first and one second supply voltage. The method does not necessarily require a token exchange and thereby minimizes storage demands on the server which distributes the digital content. The PVA foam structure is then treated with the PVA gel and heparin mixture, such as by soaking the PVA foam structure in the gel. It is possible to use a gravimetric measurement method to carry out a tare weighing of the capsules. A circuit gathers the determined substantial correspondences. A unidirectional alternating current is passed through the film in a current generator mode to effect electric thermal exposure of the film.