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1、ATUTORIALONDIGITALWATERMARKINGFernandoPerez-Gonz´alezandJuanR.Hern´andez´Dept.Tecnolog´ıasdelasComunicaciones,ETSITelecom.,UniversidaddeVigo,36200Vigo,Spainemail:fperez@tsc.uvigo.es,jhernan@tsc.uvigo.esABSTRACTareconcernedwithsecuredcommunicationsin-steadofulteriorcopyrightinfringements.Forin-Thi
2、spapergivesatutorialonthetechniquesstance,accesscontrolinset-top-boxesusedforandreferencemodelsusedindigitalwatermark-digitaltelevisiondemodulationanddecodingsuc-ing.Distorsions,attacksandapplicationsarede-ceedinavoidingunathorizedaccesstoprogramsscribedinsomedetail.Finally,theneedforbench-thatar
3、ebeingbroadcastinscrambledform[3]butmarkingisdiscussed.failinprecludingfurtherstorageandillegaldis-seminationactions.1.INTRODUCTIONThereisthenanincreasingneedforsoftware(orintheworstcase,hardware)thatallowsforInhiswonderfulbookTheCodebreakers[1],D.protectionofownershiprights,anditisinthisKahnreco
4、untsoneofthestoriesintheHistoriesofcontextwherewatermarkingtechniquescometoHerodotusinwhichHistiaeustatooedamessageourhelp.Perceptiblemarksofownershiporau-intheshavenheadofaslaveandwaitedforthethenticityhavebeenaroundforcenturiesinthenewhairtogrowbeforesendinghimtoAristago-formofstamps,seals,sign
5、aturesorclassicalwa-rasatMiletuswithinstructionstoshave–again–termarks,nevertheless,givencurrentdatamanip-theslave’shead.Obviously,bandwidthwasnotaulationtechnologies,imperceptibledigitalwater-concernatthosetimes,butmethodshaven’tchangedmarksaremandatoryinmostapplications.Adigi-somuchwhencompared
6、withthestateofthearttalwatermarkisadistinguishingpieceofinforma-indigitalwatermarking.tionthatisadheredtothedatathatitisintendedtoprotect,thismeaningthatitshouldbeverydif-SincethepublicationofaseminalworkbyficulttoextractorremovethewatermarkfromtheTanakaetal.in1990[2],wehavewitnessedanwatermarkedo
7、bject.Sincewatermarkingcanbeextraordinarygrowthoftechniquesforcopyrightappliedtovarioustypesofdata,theimperceptibil-protectionofdifferenttypesofdata,especiallymul-ityconstraintwilltakedifferentforms,dependingtimediainf
