Method for securing a multimedia content record in a storage medium

1. A method for securing a record of a multimedia content in a storage medium of a first electronic device, the method comprising an encryption operation consisting in:

for each multimedia content requiring encryption, generating a random key within the first electronic device;

encrypting the multimedia content using the random key, to obtain encrypted multimedia content;

encrypting the random key, using a user key, to obtain a first encrypted random key, said user key being received by the first electronic device from a user of the first electronic device;

encrypting the first encrypted random key using a root key specific to the first electronic device, to obtain a second encrypted random key, said root key being different from the user key;

recording the second encrypted random key and the encrypted multimedia content in the storage medium,

wherein the method comprises an operation to access the multimedia content by a second electronic device, consisting in:

decrypting, within the first electronic device, the second encrypted random key using the root key specific to the first electronic device to obtain the first encrypted random key;

establishing a secure connection between the first electronic device and the second electronic device;

transmitting, from the first electronic device to the second electronic device, the first encrypted random key over the secure connection;

transmitting, from the first electronic device to the second electronic device, the encrypted multimedia content;

decrypting, within the second electronic device, the first random key using the user key to obtain the random key, and

decrypting, within the second electronic device, the encrypted multimedia content using the random key to obtain the unencrypted multimedia content.

2. The method according to claim 1 , wherein the encrypted multimedia content is transmitted from the first electronic device to the second electronic device over the secure connection.

3. The method according to claim 1 , wherein the secure connection is established using the SSL/TLS protocol.

4. The method according to claim 1 , further comprising:

within the second electronic device, encrypting the first random key using a root key specific to the second electronic device, to obtain a modified second encrypted random key;

recording the modified second encrypted random key and the encrypted multimedia content in a storage means of the other electronic device.

5. The method according to claim 1 , wherein the root key is protected in a secure component of the first electronic device.

6. The method according to claim 1 , wherein the multimedia content is obtained in a stream of television signals received live by the first electronic device, or previously recorded within the first electronic device, or digital photographs, or private video content or soundtracks.