A content delivery apparatus, when a content delivery request is outputted from a user terminal device, encrypts the requested content with an encryption key, adds a view period to it to deliver it to a request source and delivers a viewing key in response to a view request from the user terminal device within the view period. 1 megapascals and about 20 megapascals for attaching the die to the substrate. The valve has a seat with an outlet opening leading out of the chamber through the valve body, and wherein the outlet opening has an outflow area leading out of the chamber through which the medium can flow.