CA2417176A1 - Method and apparatus for reducing a copy protection process by modifying the blanking level - Google Patents
Method and apparatus for reducing a copy protection process by modifying the blanking level Download PDFInfo
- Publication number
- CA2417176A1 CA2417176A1 CA002417176A CA2417176A CA2417176A1 CA 2417176 A1 CA2417176 A1 CA 2417176A1 CA 002417176 A CA002417176 A CA 002417176A CA 2417176 A CA2417176 A CA 2417176A CA 2417176 A1 CA2417176 A1 CA 2417176A1
- Authority
- CA
- Canada
- Prior art keywords
- picture
- vertical
- horizontal
- enhancements
- video
- 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.)
- Granted
Links
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan portion of the television picture, just prior to the horizontal or vertical sync signals but in active video, a negative going waveform that appears to the television receiver or video tape recorder to be a sync signal, thereby causing an early horizontal or vertical retrace. One version provides (in the right overscan portion of the picture), a checker pattern of alternating gray and black areas which causes the TV set on which the illegal copy is played to horizontally retrace earlier than normal in selected lines with a consequential horizontal shift of the picture information on those lines. This substantially degrades picture viewability. In another version a gray pattern at the bottom overscan portion of the picture causes vertical picture instability. In another version selected horizontal sync signals are narrowed, causing irregular vertical retraces. Also provided is apparatus for removing or attenuating these enhancements from the video signal, to allow copying.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/062,866 US5583936A (en) | 1993-05-17 | 1993-05-17 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
| US062,866 | 1993-05-17 | ||
| CA002162367A CA2162367C (en) | 1993-05-17 | 1994-05-09 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002162367A Division CA2162367C (en) | 1993-05-17 | 1994-05-09 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2417176A1 true CA2417176A1 (en) | 1994-11-24 |
| CA2417176C CA2417176C (en) | 2005-02-01 |
Family
ID=25678207
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002417180A Expired - Lifetime CA2417180C (en) | 1993-05-17 | 1994-05-09 | Method and apparatus for reducing a copy protection process by a relative increase in composite sync amplitude |
| CA002417176A Expired - Lifetime CA2417176C (en) | 1993-05-17 | 1994-05-09 | Method and apparatus for reducing a copy protection process by modifying the blanking level |
| CA002476252A Expired - Lifetime CA2476252C (en) | 1993-05-17 | 1994-05-09 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002417180A Expired - Lifetime CA2417180C (en) | 1993-05-17 | 1994-05-09 | Method and apparatus for reducing a copy protection process by a relative increase in composite sync amplitude |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002476252A Expired - Lifetime CA2476252C (en) | 1993-05-17 | 1994-05-09 | Video copy protection process enhancement to introduce horizontal and vertical picture distortions |
Country Status (1)
| Country | Link |
|---|---|
| CA (3) | CA2417180C (en) |
-
1994
- 1994-05-09 CA CA002417180A patent/CA2417180C/en not_active Expired - Lifetime
- 1994-05-09 CA CA002417176A patent/CA2417176C/en not_active Expired - Lifetime
- 1994-05-09 CA CA002476252A patent/CA2476252C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2417176C (en) | 2005-02-01 |
| CA2417180C (en) | 2005-08-02 |
| CA2476252C (en) | 2005-04-05 |
| CA2417180A1 (en) | 1994-11-24 |
| CA2476252A1 (en) | 1994-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2162367A1 (en) | Video copy protection process enhancement to introduce horizontal and vertical picture distortions | |
| AU715473B2 (en) | Method and apparatus for removing or defeating effects of copy protection signals from a video signal | |
| US5737417A (en) | Videotape anti-copying encryption scheme | |
| EP0995310B1 (en) | Protection of a component video signal | |
| US6188832B1 (en) | Method and apparatus for modifications made to a video signal to inhibit the making of acceptable videotape recordings | |
| WO1994024828A1 (en) | Horizontal pulse augmentation of a video signal | |
| US8837909B2 (en) | Digital processing disruption systems | |
| EA001026B1 (en) | Method and apparatus for treating a video signal, method for decoding a treated video signal and apparatus therfor | |
| US6295360B1 (en) | Method and apparatus to defeat composite video signal protection | |
| CA2417176A1 (en) | Method and apparatus for reducing a copy protection process by modifying the blanking level | |
| US5481608A (en) | Method and an apparatus for preventing unauthorized copying of video signals on tape | |
| GB2396767A (en) | Inserting positive-going pulses to back porch of a video signal for copy protection | |
| US8374489B2 (en) | Method and apparatus for inducing and or reducing geometric distortions in a display via positive going pulses | |
| EP0897635A1 (en) | Method and apparatus for modifications made to a video signal to inhibit the making of acceptable videotape recordings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20140509 |