Content management server, content management method, computer software and computer readable medium

A receiver (38) receives, from a mobile device of a first type adapted to read a content from a recording medium and run the content, a first device identifier identifying the mobile device of the first type and a recording medium identifier identifying a recording medium loaded in the mobile device of the first type, along with a digital signature generated using an encryption key secretly stored in the mobile device of the first type. A signature verification unit (40) verifies the authenticity of the digital signature. A voucher issuance unit (52) issues a voucher to a mobile device of a second type adapted to acquire a content by downloading the content and to run the content accordingly and mapped into the mobile device of the first type, so that the mobile device of the second type is capable of downloading a content.