A device and method for decrypting digital contents are discussed.
According to an embodiment, a method for decrypting digital content at a
target device, includes receiving the digital content without a source
encryption key from a source device connected to the target device, the
digital content having been encrypted with the source encryption key in
the source device; performing an addition operation by using a first
target internal key and an identifier (ID), the first target internal key
being associated with the target device, and the ID being associated with
at least one of the target device and a storage medium of the target
device; generating a target encryption key based on an output of the
addition operation and a second target internal key by using a
predetermined encryption algorithm, the second target internal key being
associated with the target device; and decrypting the encrypted digital
content using the target encryption key.