DVD
Let an agent explain DVDs, relay technology, formats, region coding, copy protection and preservation from technical and media history sources, describe the named formats, and distinguish DVDs from CDs, Blu-ray discs, HD DVD and streaming.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What a DVD is.
Definition
Definition.
Definition
Definition.
- What is a DVD, and how does it differ from CDs, Blu-ray, HD DVD and streaming? definition
- Is the question about playback, archiving, formats or copying, where copyright law applies? boundary
Formats
Named formats.
Formats
Formats.
- What are DVD-Video, DVD-Audio, DVD-ROM, recordable formats and MiniDVD, and what is a DVD cover? definition
- Which entry fits the specific format? action
Technology Technology.
Optics
Optical storage.
Optics
Optics.
- How do red lasers and pit sizes give DVDs more capacity than CDs? provenance
- Which references are standard? provenance
Video
DVD-Video.
Video
Video.
- How do MPEG-2, region codes and CSS work on DVD-Video? provenance
- Which sources are cited? provenance
Rights Copy protection.
CSS
Content Scramble System.
CSS
CSS.
- What is CSS, and what legal disputes followed DeCSS, with positions attributed? provenance
- Is the presentation neutral and free of circumvention guidance? boundary
Regions
Region codes.
Regions
Regions.
- Why were DVD region codes introduced? provenance
- Which entry fits DVD region code? action
Context Media history.
Format war
Successors.
Format war
Format war.
- How did Blu-ray defeat HD DVD, and how did streaming reduce disc sales? provenance
- Which entry fits high-definition optical disc format war? action
Archiving
Preservation.
Archiving
Archiving.
- How long do recordable DVDs last, and what do archivists recommend? provenance
- Which entry fits digital preservation? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Activities and processes
- Entry kind
- thing
- Plane
- ACT
- Domain
- ACT.ACT
- Other names and narrower kinds
- DVD±R, MiniDVD, DVD cover, DVD-Video, DVD-Audio, DVD-ROM, DVD card, DVD recordable, DVD-D, DVD slick, DVD-RW DL
What it is Filled
An optical disc format for digital data storage, introduced in 1995 by a consortium including Philips, Sony, Toshiba and Panasonic, storing about 4.7 GB on a single-layer 12 cm disc using a 650 nm red laser, with application formats the registry aliases name such as DVD-Video for films with MPEG-2 video, region codes and CSS copy protection, DVD-Audio for high-resolution music, and DVD-ROM for data, recordable formats DVD-R and DVD+R, collectively DVD plus-minus R, and the smaller MiniDVD; DVD covers are the packaging artwork. DVDs were succeeded by Blu-ray and streaming but remain used for archiving and physical media collections, with disc rot and scratches limiting lifespan.
Why it exists Filled
Let an agent explain DVDs, relay technology, formats, region coding, copy protection and preservation from technical and media history sources, describe the named formats, and distinguish DVDs from CDs, Blu-ray discs, HD DVD and streaming.
Distinguishing features Filled
- Red laser optical disc
- Region codes
- Multiple application formats
- Mass-market film distribution
What robots and AI may and may not do Filled
Must not
- Advise how to circumvent copy protection where that is unlawful.
- Copy or share films from DVDs in breach of copyright.
- Treat optical discs as permanent archival storage.
Only with a human decision
- Disposing of discs that may hold the only copy of someone's data or personal recordings.
May
- Explain the DVD format, its variants and its region codes.
- Advise how to store discs and migrate data from them before they degrade.
Moral aspects Filled
- Discs degrade, so family and institutional records on them can be lost.
- Copyright protects creators but can also block access to works no longer sold.
Who is affected
- Owners of discs
- Archivists
- Creators and rights holders
Owners Filled
Steward
The person who keeps the disc; rights holders own the content.
Links to other meta-models Filled
parent
- Q1048236 - registry parent class
- Q234870 - registry parent class
related
- optical disc - in registry terms
- compact disc - for video storage
- Blu-ray
- Content Scramble System - on DVD-Video
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.dvd
- Wikidata: Q5294 (https://www.wikidata.org/wiki/Q5294)
Direct properties not applicable Not applicable
- single-layer capacity: about 4.7 GB
- laser wavelength: 650 nm
- introduced: 1995 year - first players 1996 in Japan
Plane ACT: no invented physical properties.
Recognition optional Filled
- Optical disc format of 1995
- DVD plus-minus R, MiniDVD, DVD cover, DVD-Video, DVD-Audio, DVD-ROM
- CDs hold less and use infrared lasers; Blu-ray uses blue lasers and holds more; HD DVD was a rival format; streaming delivers over networks
- A shiny 12 cm or 8 cm disc in a plastic case with cover art.
Capabilities and actions required Filled
- explain technology and formats
- relay region coding and copy protection
- describe named formats
- relay preservation
Hazards and failure modes required Filled
- Disc rot and data loss
- Advising circumvention of copy protection
- Region incompatibility
Standards and interfaces required Filled
- DVD Forum specifications
- ECMA-267 DVD-ROM standard
- Copyright laws on circumvention such as the DMCA
Context of use required Filled
- Storing video, audio and data.
- DVD-Video
- DVD-Audio
- DVD-ROM
- recordable DVD-R, DVD+R and rewritable formats
- MiniDVD
Sources Filled
- Wikidata item Q5294: DVD - identity and sense of the item
- Wikipedia: DVD - general description of the item
Open questions
- Should DVD-Audio be a separate entry?
- How should preservation guidance be linked?
- Should DVD cover be moved to packaging entries?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q5294/spec.json