Invalidity dossier
US 5319705
Added 9/23/2026, 2:37:45 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 5,319,705 A
Title: Method and system for multimedia access control enablement
Patent number: US5319705A (application US07/964,324)
Assignee: International Business Machines Corp. (IBM)
Inventors: Bernard J. Halter; Alphonse M. Bracco; Donald B. Johnson; An V. Le; Stephen M. Matyas; Rostislaw Prymak, deceased; James D. Randall; John D. Wilkins
Priority/filing date: 1992-10-21
Publication (grant) date: 1994-06-07
Legal status as listed: Expired – Lifetime (anticipated expiration 2012-10-21)
Source: https://patents.google.com/patent/US5319705/en
Purpose and plain-language scope (from the supplied excerpt):
The disclosure relates broadly to data processing systems and methods, and more particularly to cryptographic systems and methods that enhance security. A digital data processing system is described as having three basic elements: a processor, a memory, and an input/output element; the I/O element may include video displays, light pens, sound synthesizers, microphones, keyboards, mice, printers, and communication adapters supporting multimedia applications.
A multimedia application may be a multimedia handler program presenting one or more multimedia objects, where each object may be a separate data file; text and non-text objects (image, graphics, formatted data, font, voice, video, animation) can be linked into a single presentation. The handler provides generalized links to arbitrary multimedia objects, allowing dynamic updates to simplify creating new versions or editions. Generalized links are said to be described in IBM application Ser. No. 07/755,709.
Software may be bundled with hardware, sold separately on media such as diskette or tape, or distributed from a central distribution processor via telephone, TV-cable, satellite, or radio. Demand for stamped media such as CD-ROM or OROM is noted, a CD-ROM holding about 600 megabytes. The prior art discussion cites file-encryption systems (Ehrsam et al., U.S. Pat. Nos. 4,386,234, 4,238,854, 4,203,166) and notes that traditional access control does not prevent one user from sharing decrypted programs and data with others. Cited references include Johnstone (4,120,030), Best (4,168,396; 4,278,837; 4,433,207), Thomas (4,446,519), and Matyas et al. (4,757,534).
What the excerpt does not establish: The supplied text is explicitly marked as an excerpt with omitted portions; it does not provide the full claims, the complete detailed description, or any figures. It also does not establish litigation, ownership changes beyond the listed assignments, validity, or a full prior-art analysis.
Generated 10/1/2026, 9:52:07 PM
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Litigation summary
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Proceedings on file (0)
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PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
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Obviousness
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Extensions
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Derivative works
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