EP1145241A2 - Ajout de cles de filigrane selon un format flexible - Google Patents

Ajout de cles de filigrane selon un format flexible

Info

Publication number
EP1145241A2
EP1145241A2 EP00956157A EP00956157A EP1145241A2 EP 1145241 A2 EP1145241 A2 EP 1145241A2 EP 00956157 A EP00956157 A EP 00956157A EP 00956157 A EP00956157 A EP 00956157A EP 1145241 A2 EP1145241 A2 EP 1145241A2
Authority
EP
European Patent Office
Prior art keywords
signal
data
encoded
marks
modulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00956157A
Other languages
German (de)
English (en)
Inventor
Petrus A. C. M. Nuijten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP00956157A priority Critical patent/EP1145241A2/fr
Publication of EP1145241A2 publication Critical patent/EP1145241A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00884—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00007—Time or data compression or expansion
    • G11B2020/00014—Time or data compression or expansion the compressed signal being an audio signal
    • G11B2020/00065—Sigma-delta audio encoding
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/283—Security features, e.g. digital codes
    • G11B23/284—Security features, e.g. digital codes on the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91335—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark

Definitions

  • the invention relates to a method for embedding supplemental data in an encoded signal and recording said signal on a disc like record carrier as recited in the preamble of claim 1.
  • the invention further relates to an arrangement for performing the method, a disc like record carrier obtained with the method and an arrangement for reproducing data recorded on such a disc like record carrier.
  • Watermarks are supplemental data messages embedded in multimedia assets, preferably in a perceptually invisible manner. They comprise information, for example, about the source or copyright status of documents and audiovisual programs. They can be used to provide legal proof of the copyright owner, and allow tracing of piracy and support the protection of intellectual property.
  • a known method of embedding supplemental data in an encoded audio and video signal without substantially effecting the perceptual quality is disclosed in European Patent Application Number 98900036.9, document Dl in the list of referred documents that can be found at the end of this description.
  • an encoder such as a sigma-delta modulator as envisaged for recording high quality audio on the audio version of the Digital Versatile Disk (DVD).
  • Such an encoder produces an output stream comprising a one-bit output sample for each encoding step in contrast to a multi-bit sample.
  • a digital watermark pattern is inserted by replacing selected bits, for example each 100th bit of the output stream, by bits of a digital watermark pattern.
  • the disclosed measures comprises determination of a unique physical characteristic of a disk, encrypting this information and writing it optically or magnetically on a disc in such a manner that it is distinguishable from the main information recorded on the disk. At reproduction of the main information, the physical characteristic of the disk is measured again and checked with the enclosed physical information so as to make a decision as to whether or not a specific relationship is present there between.
  • Such physical information may be a pit angular arrangement, a pit depth and tracking quantity, a second low reflection section, dust position and so on.
  • Such physical characteristic has to be measured, which complicates production.
  • no predetermined watermark information can be embedded in this way.
  • a further advantageous aspect of the invention is recited in claim 2. This allows combining the recording means for both signals in a large extent. In addition, recording means as well as reproducing means may be combined also. Several advantageous embodiments employing modulation of the same local areas are recited in dependent claims 3, 4 and 5.
  • Fig. 1 illustrates a record carrier of the optical readable type provided with optically detectable marks
  • Fig. 2 shows an arrangement according to the invention for recording encoded data and supplemental data at a record carrier as illustrated in Fig.1 ;
  • FIG. 3 shows in more detail an embodiment for modifying an encoded signal
  • Fig. 4 shows an example of a modified encoded bit stream
  • Fig. 5 shows an arrangement according to the invention for reproducing encoded data and extracting supplemental data from a record carrier as illustrated in Fig.1 ;
  • Fig. 6 shows in more detail means for extracting supplemental data from a stream of encoded data and supplemental data and Fig. 7 illustrates a method according to the invention for embedding supplemental data in an encoded signal.
  • Fig. 1 illustrates a possible embodiment of a record carrier 1 of the optical readable type for use in accordance with the invention.
  • Fig. la is a plan view illustrating the arrangement of optically detectable marks along a track of which the centerline is indicated by a reference sign 2.
  • Fig. lb shows a highly enlarged plan view of a part 3 illustrating the optical detectable marks 4 arranged along the track 2 and the intermediate areas or spaces 5.
  • the optically detectable marks 4 may be in the form of local depressions or so-called pits. However also other types of optically detectable marks are suitable such as for instance as obtained with phase-change materials.
  • the marks 4 result in a modulation of reflected light intensity of a radiation beam scanning along the track 2.
  • Fig. la is a plan view illustrating the arrangement of optically detectable marks along a track of which the centerline is indicated by a reference sign 2.
  • Fig. lb shows a highly enlarged plan view of a part 3 illustrating the optical detectable marks 4
  • a signal 6 is given representing this modulation for the event that the pattern of marks 4 and spaces 5 is scanned along the track 2 with a constant linear velocity.
  • the lengths of the marks 4 along the track 2 and of the intermediate spaces 5 correspond with a plurality (including one) of bit cells of the signal 6.
  • the length T of a bit cell corresponds with the period T of the data clock of the signal 6.
  • a bit cell is represented by a track part with a length L.
  • Fig. Id illustrates for example an embodiment employing variations of the width of the optical detectable marks 4. This causes an additional intensity modulation in a radiation beam scanning along the track 2 resulting in two components in the corresponding signal 6.
  • Fig le shows an embodiment employing variation of the track position in a direction transverse to the track 2.
  • This position modulation has the form of a track undulation, also known as a radial track wobble. Such track wobble can also easily be detected by the same beam scanning means as used for the detection of the marks 4.
  • Another modulation is obtained by employing variations in depth or position of the marks 4 in the plane of the recording medium 1.
  • Fig. If shows a sectional view of part 3 of the record carrier 1 along a line b-b illustrating such a modulation.
  • the reference sign 7 indicates a transparent substrate.
  • the substrate 7 is covered with a reflective layer 8.
  • a protective layer 9 covers the reflective layer 8.
  • the substrate 8 is provided with optically detectable marks 4 in the form of pits.
  • the variation of position or depth of the pits 3 is indicated by lines 10 and 11.
  • FIG. 2 shows an embodiment of an arrangement according to the invention for embedding supplemental data in an encoded signal and recording said encoded signal on a disc like record carrier as illustrated with reference to Fig.l.
  • a first data signal Dl is received at a first input terminal 20.
  • the data signal Dl may represent data, video or audio information etceteras.
  • the data signal Dl may be either in analog form or digital form. If the data signal Dl is in an analog form, a digital to analog converter 22 is provided to convert the analog data signal Dl into a digital data signal.
  • this digital audio signal is over sampled with a frequency which is again a multiplicity n of this sampling frequency f s . Resulting also in 1-bit bit stream signal BS.
  • Bit stream conversion is a high quality encoding method, with the possibility of high quality decoding or a low quality decoding with the further advantage of a simpler decoding circuit.
  • a supplemental data signal D2 representing for example watermark data, that has to be embedded in the data signal Dl or in the corresponding bit stream BS, is received at an input terminal 23.
  • Modifying means 24 are provided to modify the bit stream BS in order to embed the supplemental data signal D2 in the binary stream BS.
  • the European Patent No. 706 174 discloses a method of embedding such supplemental data D2 in a binary stream BS without substantially affecting the perceptual quality.
  • a watermark bit may replace 1 bit of every 100 bits. This will only raise the quantization noise but not prohibit reproducing the data Dl in contrast to encryption.
  • the method as disclosed in document D2 is directed to limit the raise of quantization noise to a further extent.
  • the supplemental data signal D2 is embedded in the bit stream BS' in accordance a specific encoding format. According to the invention, several different encoding formats may be used to this purpose. The number of possible formats is huge and can be specific for each disc or for a group of discs. Therefore format generation means 25 are provided to generate a specific encoding format represented by a format description signal F, which is being supplied to the modifying means 24.
  • the resulting modified bit stream BS' comprising 1 bit with a frequency of n.f s , may subsequently be applied to a decimation filter 26 to obtain a multi-bit stream of, for instance 16 bit bits with a frequency of f s .
  • This multi-bit stream is subjected, with channel encoding means 27, to appropriate channel encoding such as for example EFM modulation for converting the 8 bit wide data bytes to 14 channel bits wide channel words. Further, error correction information is added.
  • a writing radiation beam In order to record the channel bits on an optically readable recording medium 1, a writing radiation beam has to be modulated in accordance with the channel bits.
  • modulation means 29 are provided for controlling a writing radiation beam so that the length of optically readable marks and spaces there between, arranged in a track on the recording medium 1, is modulated in accordance with the obtained channel bits. This length modulation is schematically illustrated in Fig. lb.
  • a writing unit 30 comprising beyond a laser unit and optical elements, also means for positioning, in accordance with drive signals submitted by the modulation means 29, a writing spot of the radiation beam in the radial direction of the circular recording medium 1.
  • the writing spot can be moved along a track.
  • the channel bits as obtained with the modulation unit 29 control the laser unit.
  • Synchronization signals S generated by clock generating means 32 are used for determining the rate of writing the channel cells and therefore the channel clock period T as illustrated in Fig. lc.
  • control means 35 are provided for generating control signals C for controlling the arrangement.
  • the format description information F is also supplied to second encoding means 33 for encoding this information into a second encoded signal.
  • This second encoded signal is preferably subjected to a different modulation of the writing radiation beam then the previous mentioned length modulation by second modulation means 34.
  • Fig. 1 The examples shown comprises second modulation of the width of marks 4 (Fig. Id), the position of the track 3 of the marks 4 (fig. le) or the position of the marks in the recording medium 7 (Fig.l f).
  • Other type of modulation may comprise placing radial oriented stripes near the center of the disc, modulating track pitch width etceteras.
  • a reproducing arrangement has to be capable to read besides the recorded encoded and modified bit stream, also the format description information that has been recorded with a different modulation process.
  • This allows the decoder of the supplemental data to be programmable to support flexible encoding formats of the supplemental data. This can be even specific for each disk.
  • the recorded bit stream with the embedded supplemental data and the corresponding encoding format is coupled to the same medium, which guarantees comfortable usage. Both are coupled to the original legal content.
  • a 1-bit A/D converter may also be referred to as a unity bit encoder and bit stream signals as unity bit encoded signals.
  • unity bit encoders are delta modulators, sigma-delta modulators, and noise shape encoders. They also belong to the family of encoders having a feed back loop.
  • Sigma-delta modulation is envisaged for recording high quality audio on the audio version of the Digital Versatile Disk (DVD), using a sampling frequency f s of 2822400 Hz (64*44100) and having a signal to noise ratio of 115 dB.
  • Fig. 3 shows an example of a sigma-delta modulator as an embodiment of the analog to digital converter 22 in Fig. 2.
  • the data signal Dl is supplied to a subtractor 41 for subtracting the output signal BS from the input signal Dl.
  • the resulting error signal e is applied to a decoding filter 42 (a summer or integrator) to obtain a prediction signal which is subjected to a polarity detector 43.
  • the polarity detector 43 produces, at a rate determined by the sampling frequency f s , an output sample +1 or -1, in dependence on the polarity of the prediction signal.
  • a multiplexer 44 constitutes the modifying means 24 of Fig. 1.
  • This multiplexer 44 replaces selected bits of the polarity detector 43 output (for example each 100 th bit) by a watermark bit pattern D 2 in response to a selection signal SEL.
  • a signal to noise ratio of 115 dB is obtained for encoding audio signals at a sampling frequency f s of 2822400 (64*44100) Hz. It has been found that replacing 1 sample per 100 samples increases the synchronization noise by only 1 dB. This corresponds with a watermark bit rate of 28000 bits/sec.
  • Another example of embedding watermark data D is to invert samples of the encoded signal y, the watermark data D 2 being represented by the number of bit periods between successive inverted samples.
  • Fig. 4 shows an example of an input waveform 51 encoded with the embodiment shown in Fig. 3.
  • the input waveform 51 corresponds with the input signal Dl in Fig. 3, while numeral 52 denotes the encoded output signal, corresponding with the bit stream
  • an input voltage of -0,5 V is encoded as a sequence of three -IV pulses and one +1V pulse
  • the input voltage of 0V is encoded as an alternating pattern of -IV and +1 V pulses (apart from an embedded watermark pulse 54)
  • +0,5V is encoded as sequence of three +1V pulses and one -IV pulse.
  • the encoded signal is decoded again at a receiving end by reshaping the received pulses and passing them through a low-pass filter.
  • the encoded signal is demodulated by averaging
  • Watermarking in this example is performed by replacing a -1 sample by a +1 sample.
  • Numeral 54 denotes such a watermark sample.
  • the alternating pattern of +1V and -IV pulses is clearly interrupted.
  • the effect of embedding such a watermark is limited, as the reconstructed signal 53 still resembles the input signal 51. This is due, as disclosed more in detail in document Dl, that the effect is fed back, inside the feedback loop, to the input and compensated by subsequent encoding the input signal after the watermark insertion.
  • the method to insert embedded data is not only very flexible: the number and exact places of the embedded data can be chosen with a large degree of freedom.
  • the selection signal SEL in Fig. 3 determines which bits of the bit stream are watermark bits.
  • This information SEL is enclosed in the general form of format description information F in Fig, 2, which is being generated by the format generating means 25.
  • Other methods for embedding may be used, such as for example inverting selected samples of the bit stream, the watermark data being represented by the number of bit periods between successive inverted samples.
  • a secure protection is obtained by allowing a flexible format for embedding watermark data.
  • second encoding means 33 and second modulating means 34 are employed to this purpose in order to obtain even a more secure protection. Only dedicated reproducing arrangements that are provided with special detecting means would enable extraction of the embedded watermark data. It is remarked, that embedding watermark data, or other control data in the manner described, does not involve encrypting the main audio, video or general data as such.
  • the encoded bit stream is only affected by a small amount of noise, leading to an equal small reduction in a signal to noise ratio.
  • Encryption and decryption however require more data processing circuitry, leading to higher cost prices.
  • the step of modifying the encoded signal is performed inside the feedback loop of the encoder. Any modification of the encoded signal for the purpose of watermarking is thus fed back and will be compensated in a subsequent coding operation.
  • Fig. 5 shows an arrangement according to the invention for reproducing encoded data and extracting supplemental data from a record carrier of the optically readable type.
  • a disc 1 provided with optically readable marks, such as illustrated with in Fig. 1, is rotational driven by disc rotating means 61.
  • An optical pick up unit 62 radiates the disc 1 with a radiation beam generated by, for example a semi conductor laser.
  • the radiation beam or the optical pick up unit 62 is movable in radial direction of the disc 1.
  • the disc 1 is being scanned with the radiation beam along the circular track 2.
  • the radiation reflected by the disc 1 is detected by a radiation sensitive detector in the optical pick up unit 62 and converted in a electrical detection signal.
  • the variation in this electrical detection signal is reflecting the modulation in the detected radiation as induced by optically detectable marks on the disc 1.
  • the detection signal is supplied to first demodulation means 64 for deriving a focus control signal and a tracking error signal, both signals used to control the optical pick up unit 62.
  • a velocity control signal is supplied to the disc rotating means 61.
  • a synchronization signal S comprising for example the sampling frequency f s , is derived by the demodulation means 64 from the detection signal. This signal f s is used, amongst others, for decoding purposes in the decoders.
  • the first demodulating means 64 are further adapted to detect the changes in the electrical detection signal induced by variations in the length of said marks and space between the marks.
  • Fig lb illustrates the arrangement of marks 4 while Fig. lc depicts an example of a corresponding electrical detection signal 6.
  • the channel bits are derived from the electrical detection signal.
  • the channel bits are consequently converted to data bits with first decoding means 65, employing for instance EFM demodulation as known from Compact Disc (CD) data processing or EFM+ demodulation as known from Digital Versatile Disc (DVD) data processing. Also error correction is being employed.
  • the resulting data stream comprises at this stage 16 bits wide words at a sampling frequency f s .
  • this multi-bit stream is converted to a binary bit stream with an interpolation filter 66, with a sampling frequency of n.f s .
  • This bit stream is applied to a 1-bit D/A converter 67, to reconvert the bit stream audio signal into the original analogue audio signal O ⁇ .
  • second demodulation means 68 are provided to derive information from the variations in the detection signal induced by variations other than of the length of the marks and spaces between the marks.
  • variations in width, radial position or depth as illustrated in Fig. Id, Fig. le and Fig. If, respectively.
  • a variation in radial position may be separated from the variation in length, if the radial variation exhibits another frequency range, by a tuned band pass filter.
  • Variations in depth or width may be separated likewise.
  • Further other type of variations might be present such as for example marks extending in radial direction on the disc 1.
  • the signal resulting from a demodulation of the detection signal by the second demodulating means 68 comprises encoded format description information as mentioned before.
  • This information is decoded with second decoding means 69 into data word representing the format description information.
  • the second decoding means 69 supplies, on the basis of the received format description information, a format description signal F to a programmable decoder 70.
  • the programmable decoder 70 is programmed in such a way that supplemental data embedded in a bit stream according to the corresponding format, can be extracted therefrom.
  • the programmable decoder 70 receives the decoded bit stream from the first decoding means 65.
  • the format description information F may comprise a complete description of the employed format for encoding the supplemental data or only a portion thereof.
  • the format description information F may only be a number or a series of numbers denoting which bits of the bit stream comprises supplemental data, as described before, while the programmable decoder 70is adapted to handle these numbers.
  • the format description information may also comprise only a part of the total format description required for decoding. In that case the additional part may be stored previously in the second decoder 70.
  • Fig. 6 illustrates in more detail an embodiment of the programmable decoder 70 in Fig. 5, for extracting an embedded watermark from a delta modulated bit stream.
  • the modified encoded bit stream BS' such as generated by the first decoding means 65, is applied to the data input of a register 80 clocked by a selection signal SEL.
  • the output of the register 80 is the watermark pattern or other control data D 2 .
  • the selection signal SEL determines which bits of the bit stream BS' are watermark bits. It is generated by a divider stage 81 which divides the sample frequency f s , by a number n, for example 100, specified by the format description signal F such as generated by the second decoding means 70.
  • This selection signal SEL is synchronized with the corresponding signal in the recording arrangement. Synchronization can be achieved by accommodating a predetermined synchronization bit pattern in the watermark signal D 2 .
  • a sync detector 82 detects said pattern and changes the phase of divider stage 81 until the sync pattern is detected.
  • FIG. 2 Another embodiment of a reproducing arrangement is obtained when the recording arrangement as illustrated with reference to Fig. 2 is used as a home recorder and only records a so-called public watermark in the bit stream according to a public format. This would enable that all discs are watermarked, also home-recordings.
  • a corresponding reproducing arrangement such as described with reference to Fig. 5 that is combined with the same recording arrangement could detect this public watermark because its format is known.
  • a so-called private watermark and corresponding format could be reserved for official releases from industry only.
  • control information may be embedded in the encoded bit stream BS'. This control information may then be used to control the reproducing arrangement.
  • Fig. 7 illustrates a method according to the invention for embedding supplemental data in an encoded signal.
  • a first step 91 (1 ST_DAT) main first data such as video, audio or general data is received.
  • the first data is encoded in step 93 (ENC_1ST_F) in accordance to a first format, such as for example employed in CD or DVD, into channel data adapted for recording or transmitting.
  • step 92 (SUP_DAT) supplemental data to be embedded in the main data is received.
  • step 94 (2ND_F) a second format is generated, that is used as a prescription for modifying in step 95 (MOD) the encoded first data in order to embed the supplemental data therein.
  • Description information characterizing the second format or a part therefrom is also encoded in step 96 (ENC_ 3RD_F) in accordance to a third format (which may be identical to the first format) into channel data.
  • the modified encoded first data is modulated in step 97 (1ST_M0D) in accordance with a first modulation process into signals adapted for recording on a specific recording medium or transmitted on a transmission channel.
  • the encoded second format description information is modulated in step 98 (2ND_MOD) in accordance with a second, different modulation process also into signals adapted for recording of a specific recording medium. Both signals are recorded in step 99 (W) by a same recording process, such as for example with an optical scanning radiation beam.
  • both recording processes may be performed separately or being even different from each other.
  • the same recording process is employed as this has the advantage that reproducing can also being performed with one reading process. It is remarked that in the above-mentioned embodiment of a method of embedding supplemental data, is only an example. Some steps may be performed either in parallel or in series, without departing from the invention.

Abstract

L'invention concerne un procédé pour incorporer des données supplémentaires dans un signal codé, selon un format différent du format utilisé pour coder les données du signal codé, et pour enregistrer ledit signal sur un support d'enregistrement de type disque par application de marques d'un premier type physique. Les données supplémentaires sont codées selon un second format, différent du format utilisé pour coder les données du signal codé. Les données de description de format concernant le second format sont enregistrées sur le support d'enregistrement, soit avec des marques du même type physique modulées selon une seconde modulation différente, soit avec des marques d'un second type possédant différentes caractéristiques physiques par rapport au premier type.
EP00956157A 1999-07-02 2000-06-27 Ajout de cles de filigrane selon un format flexible Withdrawn EP1145241A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00956157A EP1145241A2 (fr) 1999-07-02 2000-06-27 Ajout de cles de filigrane selon un format flexible

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99202163 1999-07-02
EP99202163 1999-07-02
EP00956157A EP1145241A2 (fr) 1999-07-02 2000-06-27 Ajout de cles de filigrane selon un format flexible
PCT/EP2000/005961 WO2001003136A2 (fr) 1999-07-02 2000-06-27 Ajout de cles de filigrane selon un format flexible

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EP (1) EP1145241A2 (fr)
JP (1) JP2003504775A (fr)
KR (1) KR20010074868A (fr)
CN (2) CN1327585A (fr)
AU (1) AU6821400A (fr)
BR (1) BR0006884A (fr)
CA (1) CA2342913A1 (fr)
IL (1) IL141712A0 (fr)
WO (1) WO2001003136A2 (fr)

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EP1863030B1 (fr) 2003-01-23 2013-10-02 LG Electronics, Inc. Support de stockage lisible sur ordinateur, et procédé et appareil pour reproduire les données associées
TWI304973B (en) * 2003-01-23 2009-01-01 Lg Electronics Inc Recording medium with copy protection information formed in intermittent or alternate wobbled pits and apparatus and methods for forming, recording, and reproducing the recording medium
ES2510642T3 (es) 2003-01-24 2014-10-21 Intrinsic Id B.V. Método y dispositivo de control de acceso a medio de almacenamiento fiable
DE102004021404B4 (de) * 2004-04-30 2007-05-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Wasserzeicheneinbettung
US8209543B2 (en) 2005-09-30 2012-06-26 Nxp B.V. Watermarking of a processing module
JP2009517788A (ja) * 2005-11-29 2009-04-30 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ コピー保護手段を有する記録担体
US8050166B1 (en) * 2010-05-07 2011-11-01 General Electric Company System and method for improved data storage

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KR100381116B1 (ko) * 1994-04-18 2003-07-22 마쯔시다덴기산교 가부시키가이샤 광기록매체정보의불법복사또는불법설치방지방법및장치
TW309612B (fr) * 1994-09-22 1997-07-01 Nippon Bickter Kk
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CA2342913A1 (fr) 2001-01-11
BR0006884A (pt) 2001-10-30
IL141712A0 (en) 2002-03-10
WO2001003136A2 (fr) 2001-01-11
CN1725345A (zh) 2006-01-25
JP2003504775A (ja) 2003-02-04
WO2001003136A3 (fr) 2001-05-03
KR20010074868A (ko) 2001-08-09
CN1327585A (zh) 2001-12-19
AU6821400A (en) 2001-01-22

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