Inevitable vulnerability in copy protection
The
analog hole
(also known as the
analog loophole
or
analog gap
) is a perceived fundamental and inevitable
vulnerability
in
copy protection
schemes for noninteractive works in
digital
formats which can be exploited to duplicate copy-protected works using
analog
means. Once digital information is converted to a human-perceptible (analog) form, it is a relatively simple matter to digitally recapture that analog reproduction in an unrestricted form, thereby fundamentally circumventing any and all restrictions placed on
copyrighted
digitally distributed work. Media publishers who use
digital rights management
(DRM), to restrict how a work can be used, perceive the necessity to make it visible or audible as a "hole" in the control that DRM otherwise affords them.
[1]
Overview
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Although the technology for creating
digital recordings from analog sources
has existed for some time, it was not necessarily viewed as a "hole" until the widespread deployment of DRM in the late 1990s. However, if the correct equipment is not used to perform the conversion, the resulting copy may have distinguishable
low fidelity
(or other deformations) compared to the analog (or digital) original.
[2]
Regardless of any digital or
software
copy control mechanisms, if
sound
can be captured by a
microphone
, it can be either
recorded
by analog means (e.g.
magnetic tape
), or stored digitally. And if images (static images or video/film), including
text
, can be seen by a camera, they can also be recorded. In the case of text the image can be converted back to text using
optical character recognition
(OCR). In the case of
streaming music
services, software exists that can digitally capture the analog output of a personal computer's
sound card
, and then save in a portable music format with no perceptible loss in quality.
Response
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In 2002 and 2003, the U.S. motion picture industry publicly discussed the possibility of legislation to "close the analog hole"?most likely through regulation of digital recording devices, limiting their ability to record analog video signals that appear to be commercial audiovisual works. These proposals are discussed in the
Content Protection Status Report
,
Consumer Broadband and Digital Television Promotion Act
, and
Analog Reconversion Discussion Group
. Inventors of
digital watermark
technologies were particularly interested in this possibility because of the prospect that recording devices could be required to screen inputs for the presence of a particular watermark (and hence, presumably, their manufacturers would need to pay a
patent
royalty to the watermark's inventor).
The motion picture industry has also pursued several private-sector approaches to eliminating the analog hole; these might be implemented without additional legislation.
- Analog signals can be degraded in ways that interfere with or confuse some recording devices. For example,
Macrovision
attempts to defeat recording by
VCRs
and
DVD
players by outputting a deliberately distorted
signal
, crippling the
automatic gain control
for
video
, causing the
brightness
to fluctuate wildly. While this is only supposed to happen to copies, it may, as an inadvertent side-effect, happen when viewing the original video as well. Some vendors claim to have developed equivalent techniques for preventing recording by video capture cards in
personal computers
. Devices exist, however, to counteract this measure.
- Manufacturers of recording devices can be required to screen analog inputs for watermarks (or
Macrovision
or
DCS Copy Protection
or
CGMS-A
) and limit recording as a condition of private
contracts
. For example, a manufacturer who licenses patents or
trade secrets
associated with a particular DRM scheme might also be obliged as a purely contractual matter to add recording limitations to digital recording products.
- Manufacturers of certain playback devices such as
set-top boxes
can be required, as a condition of private contracts, to allow publishers or broadcasters to disable analog outputs entirely, or to degrade the analog output quality, when particular programming is displayed. This capability is one example of
selectable output control
. A broadcaster could then prevent all recording of a broadcast program by indicating that compliant receiving devices should refuse to output it through analog outputs at all. On some of the latest playback devices, analog outputs have been eliminated completely.
In theory, it is possible to bypass all these measures by constructing a player that creates a copy of every frame and sound it plays. Although this is not within the capability of most people, many bootleggers simply record the video being displayed with a video camera or use recording and playing devices that are not designed to use the protection measures. In fact, the
Motion Picture Association of America
has recommended use of a camcorder as an alternative to circumventing the
Content Scrambling System
on DVDs.
[3]
See also
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References
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External links
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