Technique for handling media content to be accessible via multiple media tracks

A method of handling media content that is to be accessible via multiple media tracks of a media file, comprising:

• receiving a set of one or more first layer data items, each first layer data item being decodable to be rendered as a portion of the media content;
• storing the first layer data items to be accessible via a first media track of the media file;
• receiving a set of one or more encrypted second layer data items, each second layer data item being decodable to be rendered in combination with at least one decoded first layer data item as an enhanced portion of the media content, wherein the encrypted second layer data items are received together with associated encrypted track reference indices that identify the first media track with the first layer data items;
• and
• storing the encrypted second layer data items together with the encrypted track reference indices to be accessible via at least one second media track.

A computer program product stored on a non-transitory computer readable recording medium and comprising program code portions that, when executed by a device, cause the device to handle media content that is to be accessible via multiple media tracks of a media file, the program code portions causing the device to:

• provide a set of one or more first layer data items that are to be accessible via a first media track, each first layer data item being decodable to be rendered as a portion of the media content;
• provide a set of one or more second layer data items that are to be accessible via at least one second media track, each second layer data item being decodable to be rendered in combination with at least one decoded first layer data item as an enhanced portion of the media content;
• associate with each second layer data item a track reference index that identifies the first media track via which the first layer data items are accessible;
• and
• encrypt at least the second layer data items and the associated track reference indices.

A device for handling media content that is to be accessible via multiple media tracks of a media file, comprising:

• a first circuit configured to provide a set of one or more first layer data items that are to be accessible via a first media track, each first layer data item being decodable to be rendered as a portion of the media content;
• a second circuit configured to provide a set of one or more second layer data items that are to be accessible via at least one second media track, each second layer data item being decodable to be rendered in combination with at least one decoded first layer data item as an enhanced portion of the media content;
• a track reference indexing circuit configured to associate with each second layer data item a track reference index that identifies the first media track via which the first layer data items are accessible;
• and
• an encryption circuit configured to encrypt at least the second layer data items and the associated track reference indices.