The error detection code adding circuit adds error detection codes to watermark data. An encrypting circuit encrypts the error detection code added watermark data according to a first password. N encoders hide (embed) the encrypted error detection code added watermark data in the content data by N different hiding algorithms, respectively. A selector selects one of N encoders in response to a selection signal and outputs the encoded and selected content data in which the encrypted error detection code added watermark data is hidden. N decoders read watermark data and the error detection codes from the encoded content data by N extracting algorithms corresponding to the N hiding algorithms, respectively, to output N extracted content data including N read watermark data and N error detection codes and N read watermark data, respectively. Decrypting circuits decrypt the N read watermark data and the N error detection codes from the N encoders according to a second password corresponding to the first password, respectively. The error detecting circuits for detecting errors in the N error detection codes, respectively. The selector selects and outputs one of the N extracted (inverse-hidden) contents data according to the detected errors.

_ error detección código adding circuito agregar error detección código filigrana dato. _ uno encrypting circuito cifrar error detección código agregar filigrana dato según uno primero contraseña. _ n codificador ocultar (encajar) cifrar error detección código agregar filigrana dato en contenido dato por n diferente hiding algoritmo, respectivo. _ uno selector seleccionar uno n codificador en respuesta uno selección señal y salida encoded y seleccionar contenido dato en que cifrar error detección código agregar filigrana dato ser hidden. _ n decodificador leer filigrana dato y error detección código encoded contenido dato por n extracting algoritmo corresponding n hiding algoritmo, respectivo, salida n extracted contenido dato incluyendo n leer filigrana dato y n error detección código y n leer filigrana dato, respectivo. _ decrypting circuito descifrar n leer filigrana dato y n error detección código n codificador según uno segundo contraseña corresponding primero contraseña, respectivo. _ error detecting circuito para detecting error en n error detección código, respectivo. _ selector seleccionar y salida uno n extracted (inverso-ocultar) contenido dato según detected error. _

 
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