Global Patent Index - EP 1095517 A1

EP 1095517 A1 2001-05-02 - MULTIMEDIA ADAPTIVE SCRAMBLING SYSTEM (MASS)

Title (en)

MULTIMEDIA ADAPTIVE SCRAMBLING SYSTEM (MASS)

Title (de)

MULTIMEDIAADOPTIVES VERSCHLÜSSELUNGSSYSTEM

Title (fr)

SYSTEME DE BROUILLAGE MULTIMEDIA ADAPTATIF (MASS)

Publication

EP 1095517 A1 (EN)

Application

EP 99919913 A

Priority

  • US 9908635 W
  • US 8248898 P

Abstract (en)

[origin: WO9955089A1] A system (300, 500) for scrambling digital samples (115, 200, 250, 260, 270) of multimedia data, including audio and video data samples, such that the content of the samples is degraded but still recognizable, or otherwise provided at a desired quality level. The samples may be in any conceivable compressed or uncompressed digital format, including Pulse Code Modulation (PCM) samples, samples in floating point representation, samples in companding schemes (e.g., mu -law and A-law), and other compressed bit streams. The quality level may be associated with a particular signal to noise ratio, or quality level that is determined by objective and/or subjective tests, for example. A number of LSBs can be scrambled in successive samples in successive frames (FRAME A, FRAME B, FRAME C). Moreover, the parameters for scrambling may change from frame to frame. Furthermore, all or part of the scrambling key (310) can be embedded (340) in the scrambled data and recovered at a decoder (400, 600) to be used in descrambling. After descrambling, the scramble key is no longer recoverable because the scramble key itself is scrambled by the descrambler.

IPC 1-7 (main, further and additional classification)

H04N 7/167

IPC 8 full level (invention and additional information)

H04K 1/00 (2006.01); H04L 9/20 (2006.01); H04N 7/167 (2011.01)

CPC (invention and additional information)

H04K 1/00 (2013.01); H04L 9/0656 (2013.01); H04N 7/1675 (2013.01); H04N 21/23476 (2013.01); H04N 21/44055 (2013.01); H04N 21/63345 (2013.01); H04L 2209/60 (2013.01)

Citation (search report)

See references of WO 9955089A1

Designated contracting state (EPC)

DE FR GB NL

EPO simple patent family

WO 9955089 A1 19991028; AU 3752599 A 19991108; CA 2329315 A1 19991028; CN 1151673 C 20040526; CN 1301460 A 20010627; EP 1095517 A1 20010502; JP 2002512494 A 20020423; MX PA00010337 A 20030519

INPADOC legal status


2003-05-14 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20021031

2001-12-12 [RAP1] TRANSFER OF RIGHTS OF AN APPLICATION

- Owner name: VERANCE CORPORATION

2001-05-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001117

2001-05-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB NL