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1、Kaleido:YouCanWatchItButCannotRecordItLanZhang1,ChengBo2,JiahuiHou3,4,Xiang-YangLi1,3YuWang2,KebinLiu1,YunhaoLiu11SchoolofSoftwareandTNLIST,TsinghuaUniversity,China2DepartmentofComputerScience,UniversityofNorthCarolinaatCharlotte,USA3DepartmentofComputerScience,IllinoisInstitu
2、teofTechnology,USA4DepartmentofComputerScience,UniversityofScienceandTechnologyofChina,China{lan,kebin,yunhao}@greenorbs.com,{cbo1,Yu.Wang}@uncc.edu,{jhou11,xli}@cs.iit.eduABSTRACTlinks[14,20,22–24,26–28,35,44,45,50].Inthispaperwestudyarelevantbutdifferentproblem:howtopreventu
3、nauthorizedusersRecentlyanumberofsystemshavebeendevelopedtoimplementfromvideotapingavideoplayedona(projected)screen(suchasandimprovethevisualcommunicationoverscreen-cameralinks.inacinemaoralecturehall)forhigh-qualityredisplaywhiledoInthispaperwestudyanoppositeproblem:howtoprev
4、entu-notaffecttheviewingexperienceofliveaudiences.Whileexistingnauthorizedusersfromvideotapingavideoplayedonascreen,techniquestrytomaximizedecodabilityofscreen-camerachannel,suchasinatheater,whiledonotaffecttheviewingexperienceweseektomaximizethequalitydegradationofthedisplay-
5、cameraoflegitimateaudiences.Weproposeanddevelopalight-weightchannelwhileretainthequalityofthescreen-eyechannel.Atech-hardware-freesystem,calledKALEIDO,thatensurestheseprop-nologydevelopedinthisregardwillhavealastingeffectinprotect-ertiesbytakingadvantageofthelimiteddisparities
6、betweentheingthecopyrightofthevideo,preventingaudiencesfromtakingascreen-eyechannelandthescreen-camerachannel.KALEIDOdoeshigh-qualitypiratedcopyofthevideo(calledpiratevideohereafternotrequireanyextrahardwareandispurelybasedonre-encodinginthiswork).Filmpiracycauseslostofrevenue
7、about$20.5billiontheoriginalvideoframeintomultipleframesusedfordisplaying.annuallyaccordingtoarecentsurvey[6],andover90%ofthisille-WeextensivelytestoursystemKALEIDOusingavarietyofsmart-galonlinecontentisdeliveredfromthesepiratemovies[4].Unau-phonecameras.Ourexperimentsconfirmth
8、atKALEIDOpreservesthorizedvideotapingduringtheexhibitioncould
