A fastener assembly having an elongated shaft with an exterior surface defining a plurality of open-ended longitudinaily-extending splines on one end of the shaft and a second plurality of longitudinally-oriented closed-ended spline circumferentially spaced from the first splines. The warm-up apparatus includes a heater for warming up, a current detector, a voltage detector and a resistance changer. The elastic deformation is obtained by exerting a releasing force thrusting a connecting section of the two braches of the pin. It is desirable that the synthetic resin film as the recording layer 3 be a polyester film, particularly a polyethylene terephthalate film. A request is automatically issued to the rights holders to approve use of the asset for the project.