CA2387150C - Conditional access information arrangement - Google Patents
Conditional access information arrangement Download PDFInfo
- Publication number
- CA2387150C CA2387150C CA002387150A CA2387150A CA2387150C CA 2387150 C CA2387150 C CA 2387150C CA 002387150 A CA002387150 A CA 002387150A CA 2387150 A CA2387150 A CA 2387150A CA 2387150 C CA2387150 C CA 2387150C
- Authority
- CA
- Canada
- Prior art keywords
- video data
- conditional access
- compressed video
- payloads
- entitlement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Systems (AREA)
Abstract
Apparatus in a receiver, for processing transmitted entitlement control information, includes a packet transport processor for selecting signal packets having payloads containing a conditional access payload header and a remaining payload of entitlement data. Respective payload headers include groups of bytes which are coded in a manner to allow or disallow the respective receiver from processing the entitlement data. A conditional access filter preprogrammed with a subscriber specific conditional access codeword examines respective byte groupings of the conditional access header for a match with the subscriber specific conditional access codeword. Only if a match occurs is the processor permitted to process the entitlement data. The entitlement data is thereafter utilized to generate decryption keys for descrambling portions of the transmitted signal.
Claims (6)
1. In a receiver for processing a packet signal including at least packets having payloads identifiable as containing compressed video data and identifiable as containing entitlement data having predetermined conditional access codes, apparatus comprising:
means for applying said packet signal;
a transport processor, responsive to said packet signal, for selecting signal packets having payloads identified as containing said entitlement data or said compressed video data;
a matched filter, programmed in a first mode to detect compressed video data start codes in the payloads of selected packets containing compressed video data, and programmed in a second mode to detect the predetermined conditional access codes in payloads of selected packets containing entitlement data.
means for applying said packet signal;
a transport processor, responsive to said packet signal, for selecting signal packets having payloads identified as containing said entitlement data or said compressed video data;
a matched filter, programmed in a first mode to detect compressed video data start codes in the payloads of selected packets containing compressed video data, and programmed in a second mode to detect the predetermined conditional access codes in payloads of selected packets containing entitlement data.
2. The apparatus set forth in claim 1, wherein said compressed video data start codes are MPEG video data start codes.
3. The apparatus set forth in claim 1, wherein said matched filter includes a comparator for comparing N-bytes of said payload with N-bytes of programmed data, N a positive integer.
4. The apparatus set forth in claim 3, wherein said compressed video data start codes are MPEG video data start codes.
5. In a receiver for processing a packet signal including at least packets having payloads identifiable as containing compressed video data having video data start codes and identifiable as containing entitlement data having conditional access codes, a method of processing said packet signal comprising:
providing said packet signal;
providing a programmable packet selector;
providing a matched filter for determining predetermined signal patterns;
programming said packet selector to select packets containing compressed video data in a first mode, and to select packets containing said entitlement data in a second mode;
programming said matched filter to recognize the video data start codes within payloads of compressed video data in said first mode, and programming said matched filter to recognize the conditional access codes in payloads of said entitlement data in said second mode.
providing said packet signal;
providing a programmable packet selector;
providing a matched filter for determining predetermined signal patterns;
programming said packet selector to select packets containing compressed video data in a first mode, and to select packets containing said entitlement data in a second mode;
programming said matched filter to recognize the video data start codes within payloads of compressed video data in said first mode, and programming said matched filter to recognize the conditional access codes in payloads of said entitlement data in said second mode.
6. The method set forth in claim 5, wherein said matched filter is programmed to recognize MPEG start codes in said first mode.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/232,794 US5619501A (en) | 1994-04-22 | 1994-04-22 | Conditional access filter as for a packet video signal inverse transport system |
| US08/232,794 | 1994-04-22 | ||
| CA002188127A CA2188127C (en) | 1994-04-22 | 1995-03-15 | Conditional access information arrangement |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002188127A Division CA2188127C (en) | 1994-04-22 | 1995-03-15 | Conditional access information arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2387150A1 CA2387150A1 (en) | 1995-11-02 |
| CA2387150C true CA2387150C (en) | 2005-09-13 |
Family
ID=25678744
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002387154A Expired - Lifetime CA2387154C (en) | 1994-04-22 | 1995-03-15 | Transport packet filter for packet video system |
| CA002387150A Expired - Lifetime CA2387150C (en) | 1994-04-22 | 1995-03-15 | Conditional access information arrangement |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002387154A Expired - Lifetime CA2387154C (en) | 1994-04-22 | 1995-03-15 | Transport packet filter for packet video system |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2387154C (en) |
-
1995
- 1995-03-15 CA CA002387154A patent/CA2387154C/en not_active Expired - Lifetime
- 1995-03-15 CA CA002387150A patent/CA2387150C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2387150A1 (en) | 1995-11-02 |
| CA2387154A1 (en) | 1995-11-02 |
| CA2387154C (en) | 2007-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20150316 |