초록 ▼

In an electronic musical apparatus, a media ID (MD1, MD2, MD3, MD4, MD5) is associated with each recording media of a memory card 8, hard disk device 10, flash memory ROM 11, CD-ROM 12 and internet 15. Each media ID is encrypted to be recorded on a different position in a ROM 2. Upon reading a music

In an electronic musical apparatus, a media ID (MD1, MD2, MD3, MD4, MD5) is associated with each recording media of a memory card 8, hard disk device 10, flash memory ROM 11, CD-ROM 12 and internet 15. Each media ID is encrypted to be recorded on a different position in a ROM 2. Upon reading a music content, the media ID of the corresponding recording media is decoded to decode the music content based upon the media ID and the secret key, and then, the resultant is temporarily stored in a RAM 3. Upon writing a music content, it is encrypted based upon the media ID corresponding to a recording media and the secret key, and the content in the RAM 3 is deleted. This makes cryptanalysis hard to thereby enhance a protection level of a music content in an electronic musical apparatus.

대표청구항 ▼

What is claimed is: 1. An electronic musical apparatus for reproducing encrypted music contents received from any one of plural types of music content sources, the electronic musical apparatus comprising: a storage device for storing a secret key and a plurality of source IDs each unique to one of

What is claimed is: 1. An electronic musical apparatus for reproducing encrypted music contents received from any one of plural types of music content sources, the electronic musical apparatus comprising: a storage device for storing a secret key and a plurality of source IDs each unique to one of the plurality types of music content sources; a memory for storing computer executable instructions; and a processor coupled to the memory for executing the computer executable instructions for causing the electronic musical apparatus to reproduce encrypted music contents by: loading an encrypted music content from one of the music content sources, wherein the encrypted music content includes encrypted common key information, encrypted security information, and encrypted music piece information, wherein the encrypted common key information is encrypted with a secret key, and wherein the encrypted security information includes copyright information and content ID; determining a type of the one of the music content sources; retrieving a source ID for the determined type of the one of the music content sources and the secret key from the storage device; retrieving the encrypted common key information, decrypting the encrypted common key information using the retrieved secret key, and retrieving the common key from the decrypted common key information; generating a first key using the retrieved common key and the retrieved source ID; retrieving the encrypted security information, decrypting the encrypted security information using the first key, and retrieving the content ID from the decrypted security information; and decrypting the encrypted music piece information using the retrieved content ID and reproducing the decrypted music piece information. 2. The electronic musical apparatus as claimed in claim 1, wherein the retrieved content ID comprises a second key for decrypting the encrypted music piece information. 3. A non-transitory computer-readable storage medium storing a computer executable instructions for reproducing encrypted music contents received from any one of plural types of music content sources, wherein the computer executable instructions when executed by an electronic musical apparatus causes the electronic musical apparatus to perform the method steps of: loading an encrypted music content from one of the music content sources, wherein the encrypted music content includes encrypted common key information, encrypted security information, and encrypted music piece information, wherein the encrypted common key is encrypted with a secret key, and wherein the encrypted security information includes copyright information and content ID; determining a type of the one of the music content sources retrieving a source ID for the determined type of the one of the music content sources and the secret key from a storage device for storing the secret key and a plurality of source IDs each unique to one of the plurality types of music content sources; retrieving the encrypted common key information, decrypting the encrypted common key information using the retrieved secret key, and retrieving the common key from the decrypted common key information; generating a first key using the retrieved common key and the retrieved source ID; retrieving the encrypted security information, decrypting the encrypted security information using the first key, and retrieving the content ID from the decrypted security information; and decrypting the encrypted music piece information using the retrieved content ID and reproducing the decrypted music piece information. 4. The non-transitory computer-readable storage medium as claimed in claim 3, wherein the retrieved content ID comprises a second key for decrypting the encrypted music piece information. 5. A method of reproducing encrypted music contents received from any one of plural types of music content sources in an electronic musical apparatus, the method comprising the steps of: loading, into the electronic musical apparatus, an encrypted music content from one of the music content sources, wherein the encrypted music content includes encrypted common key information, encrypted security information, and encrypted music piece information, wherein the encrypted common key information is encrypted with a secret key, wherein the encrypted security information includes copyright information and content ID, and wherein the electronic musical apparatus includes a storage device; determining, by the electronic musical apparatus, a type of the one of the music content sources; retrieving, by the electronic musical apparatus, a source ID for the determined type of the one of the music content sources and the secret key from a storage device for storing the secret key and a plurality of source IDs each unique to one of the plurality types of music content sources; retrieving, by the electronic musical apparatus, the encrypted common key information, decrypting the encrypted common key information using the retrieved secret key, and retrieving the common key from the decrypted common key information; generating, by the electronic musical apparatus, a first key using the retrieved common key and the retrieved source ID; retrieving, by the electronic musical apparatus, the encrypted security information, decrypting the encrypted security information using the first key, and retrieving the content ID from the decrypted security information; and decrypting, by the electronic musical apparatus, the encrypted music piece information using the retrieved content ID and reproducing the decrypted music piece information. 6. The method as claimed in claim 5, wherein the retrieved content ID comprises a second key for decrypting the encrypted music piece information.