digital cinema technology and security
TRANSCRIPT
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The Big Picture: Digital Cinema Technology and Security
Mike Renlund
Digital Cinema Specialist
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Film: How its always been done
• 35mm film is the standard, more than a mile of it for one movie.
• IMAX film is 10 times larger than 35mm.
• The image hasn’t been upgraded much in the more than a century that movies have been playing.
• The only real upgrade was from Black and White, to Color.
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Film Sound and Image
DTS Timecode
Analog
Dolby SRD
Sony SDDS
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Distribution/Security of Film Prints
• 70 lbs (32 kg) cans with the film inside.
• Security measures include:
• Codenames for content
• Separate shipments
• Physical locks on the cans
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DLP technology
• First designed in 1987 By Dr. Larry Hornbeck at Texas Instruments.
• It took a long time to make a splash in the Movie market.
• The first major release in digital cinema was in 2005.
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The DLP Chip
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So how tiny are these mirrors?
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Even closer!
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Creating an image (greyscale)
DMD Chip Lens
Screen
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And finally, what it really looks like
Red DMD
Green DMD
Blue DMD
Lens
Light Pipe
Prism
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A couple different DLP projectors
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Sony SXRD
• Silicon X‐tal Reflective Display
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Resolution
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Digital Cinema Distribution
• Multiple methods of delivery
• Hard Drive
• Network Transfer
• Satellite
• Interesting facts about content
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Security in Digital Cinema
Step 1:
1. Content is served out from a storage point, to the Media Block
2. The content is encrypted.
Content StorageRaid Array
Media Block(Decoder)
Internal to the same box, or two separate devices
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• The Show Player decodes the video/audio with the KDM, the audio is passed to the audio processor.
• The video is re‐encrypted with Cinelink II, and sent to the projector.
Media Block(Decoder)
Up to 16 channels of uncompressed audio
Audio Processor
Projector
Dual Link HDSDIRunning Cinelink II
Ethernet
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Cryptography Section
ProjectorMedia Block(Decoder)
• Sha1 256 key
• Secure connection to the Media Block
• No open access panels
• Sha1 256 key• Correct Date Range• Correct content• No tampering detected
Any of these fail, and you cannot play the movie
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KDM or Key Delivery Message• <ds:X509IssuerName>dnQualifier=\+62TOmh@eqB0D1966oR2gdu7SdM=,
CN=Root.CA.DC.Cinea.Com,OU=CA.DC.Cinea.Com,O=DC.Cinea.Com</ds:X509IssuerName>
• <ds:X509SerialNumber>1799</ds:X509SerialNumber> • </X509IssuerSerial>• <X509SubjectName>dnQualifier=TRxe7YERGorsOIg1M/WegWToIvrs=,CN
=SM.Dolby‐DSP100‐00000000,O=DC.Cinea.Com,OU=DolbyShowPlayer</X509SubjectName>
• </Recipient>• <CompositionPlaylistId>urn:uuid:d12ky0XqY‐f997‐c039‐aece‐
4a0af0b982d3</CompositionPlaylistId> • <ContentTitleText>DEFCON_FTR_S_EN‐XX_US‐
NC_51_2K_DI_20080808_Mike</ContentTitleText> • <ContentKeysNotValidBefore>2008‐08‐08T06:01:00‐
00:00</ContentKeysNotValidBefore> • <ContentKeysNotValidAfter>2008‐08‐10T09:59:00‐
00:00</ContentKeysNotValidAfter>
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When a security breach is detected
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A couple other security methods in Digital Cinema
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Searching for Pirates…Forensic Marking DCDM
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Forensic Marking POM
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Security Wrap up
• How tough is Digital Cinema Security Overall?
• Are there any weaknesses?
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3D Technology
• Have you seen a film in 3D before?
• What did you think?
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Anaglyph Technology
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Two problems with 3D films
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How digital cinema fixes the problem
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Digital Cinema 3D technologies
• There are a couple of major companies that produce 3D equipment.
• They use different methods to make the 3D effect. The main methods are:
• 1. Circular Polarization
• 2. Wavelength Multiplex
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Method 1: Basic Circular Polarization
Projector
Projector
L
R
SCREEN
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Method 1: Circular Polarization
Projector
SCREEN
Z Screen
Polarizes LeftAndPolarizes Right
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Method 1: Circular Polarization
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Circular Polarization continued…• Real D was the first major 3D format in digital cinema.
• These glasses are disposable, due to the low cost in making plastic circular polarized lenses.
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Method 2: Wavelength Multiplex • Dolby 3D is new on the block• Uses Wavelength Multiplex Technology. Licensed from INFITEC.
• These glasses are reusable.
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Method 2: Wavelength MultiplexSCREEN
Dolby 3D FilterLight Engine (DLP)
Lamp
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Which is better?• This is my opinion on it:
Real D
Dolby 3D
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So, what’s coming in 3D
• Tim Burton’s ALICE IN WONDERLAND
• SHREK GOES FOURTH
• James Cameron’s AVATAR
• Michael Bay’s TRANSFORMERS 2
• And of course, STAR WARS
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3D Wrap‐up
• Where are the best 3D presentations found?
• Do your research. This can be a bit difficult, as many theatres don’t have a clue which 3D system they use, but can save you a headache, and enhance your viewing experience.
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Alternative Content
• Metropolitan Opera…yup, you know you love opera.
• Sports Events‐Dallas Mavericks games have been aired at local movie theatres in 3D.
• Concerts: U23D and others
• Oh, and if you are in any way interested, Some places let you:
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Play HALO 3 on the big screen!
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Q & A
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Resources:
• Some images and design elements by: • Craig T. Morris ([email protected])• Taylor & Brett for FTP and PDF resources
• Slides 7 and 8: TI/dlp.com• Slide 12: Sony SXRD• Slide 26: Library of Congress; Jaws 3D Poster (Universal Pictures)
Thanks for Coming!Q & A continues across
the hall in room 104 (Q&A 3)
Email: [email protected]
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Resources Continued:• Texas Instruments: www.dlp.com• NEC Projectors: www.necam.com/dc• Barco Projectors:
http://www.barco.com/corporate/en/products/category.asp?catid=11• Sony Projectors: http://pro.sony.com/bbsccms/ext/SXRD/index.shtml• Infitec: http://www.infitec.net/infi_e.html
• Dolby Labs: www.dolby.com• Real D: www.reald.com• Special thanks to Dr. Pepper (for keeping me awake): www.drpepper.com