Video surveillance systems using out of band key exchange
US-12177293-B2 · Dec 24, 2024 · US
Conditional entitlement processing for obtaining a control word
US8958558B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8958558-B2 |
| Application number | US-71504710-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 1, 2010 |
| Priority date | Mar 2, 2009 |
| Publication date | Feb 17, 2015 |
| Grant date | Feb 17, 2015 |
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- Title
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Abstract
Official abstract text for this publication.
Embodiments of the invention provide an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. Embodiments of the invention can be used in a conditional access system such as a Pay-TV system.
First claim
Opening claim text (preview).
What is claimed is: 1. A method in a receiver, the method comprising: receiving an entitlement control message (ECM) and an entitlement management message (EMM), the ECM including a first subkey, the EMM including a second subkey, a membership data, and a receiver unique key; decrypting or transforming the first subkey under control of the EMM; and either: (a) in response to determining, based on the membership data, that a control word is invoked: decrypting or transforming t…
Assignees
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Classifications
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H04L9/14Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8958558B2 cover?
- Embodiments of the invention provide an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the cont…
- Who is the assignee on this patent?
- Eisen Philip Allan, Benedetti Ettore, Van Foreest Arnoud Evert, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification H04L9/14. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 17 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).