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Optical storage medium with limited access

A storage medium, optical technology, applied in information storage, optical record carrier, recorded information storage, etc., can solve the problem of unfriendly area code

Inactive Publication Date: 2009-08-05
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The problem here is that when the movie's global theater release ends ( figure 1 time in t C ), region codes, which can be considered a specific example of restricted data used to restrict access to content, become unnecessary
At this point, the region code even becomes quite unfriendly and annoying for DVD consumers looking to watch a DVD copy of this movie in a relative or friend's country

Method used

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  • Optical storage medium with limited access
  • Optical storage medium with limited access
  • Optical storage medium with limited access

Examples

Experimental program
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Embodiment Construction

[0038] figure 2 An optical storage medium 20 according to the present invention is shown. The optical storage medium 20 includes a first data layer 21, such as a BD data layer (for example, a BD-ROM, BD-R, or BD-RE layer). In addition, the optical storage medium 20 includes a second data layer 23, such as a DVD data layer (e.g., DVD-ROM / R / RW / RAM / ±R / ±RW). The second data layer 23 is bonded to the substrate 25 with the third layer 27. The third layer 27 may be an ez-D layer, which includes an adhesive combined with a reactant. The reactants in the third layer 27 act to provide the data contained in the second data layer 23 with a limited lifespan. Preferably, the optical storage medium 20 further includes a cover layer 29 and a substrate 31, the cover layer is used to cover the first data layer 21, which is, for example, a polycarbonate layer, and the substrate 31 is, for example, a polycarbonate layer.

[0039] This storage medium is also commonly referred to as a hybrid disc. It...

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Abstract

The present invention relates to an optical storage medium (20) comprising a first data area (21) for storing content and a second data area (23) for storing limitation data (24) for limiting access to at least a portion of the first data area. It is desired that the period of time for which access to content stored on the storage medium is limited, such that, for instance, after said period of time unlimited access to said content is granted. To achieve this a state change means (27) is provided on the storage medium, adapted for changing its optical reflectivity and / or transmittance over time, said change directly preventing access to the second data area after a limited period of time or being indirectly used to decide whether access to the at least one portion of the first data area shall be limited according to said limitation data.

Description

Invention field [0001] The present invention relates to an optical storage medium, a device for accessing the optical storage medium, and a corresponding method. Background technique [0002] Each type of DVD video disc includes one or more region codes, which indicate the region(s) of the world where the video disc is intended to be distributed and reproduced. Commercial DVD video player specifications stipulate that the player can only play discs that contain its region code. The area code is defined as a single byte, and one bit is allocated to each area. Whether this bit is assigned as 0 or 1 indicates whether the disc can be played in the specific area. However, at a higher level, each player is assigned one of the 7 areas; during playback, the player uses the "RMA" byte (RMA: Area Management) on the DVD-Video disc to verify its internal Area code. In fact, the RMA byte is an 8-bit mask (if one bit=0, the player in the corresponding area can play this kind of disc). The RMA ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/00G11B7/24G11B7/0037G11B7/24038
CPCG11B23/282G11B7/0037G11B7/252G11B7/24038G11B7/24G11B7/241G11B7/007
Inventor 李周镒A·E·T·凯珀R·J·M·武勒斯D·帕斯奎里洛
Owner KONINK PHILIPS ELECTRONICS NV