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A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type being packets carrying data repres

A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type being packets carrying data representing a video slice wherein the video slice contains a larger amount of data than a threshold (or a subsequent slice). The packets identified as being of the specified packet type are encrypted using a first encryption method to produce first encrypted packets. These first encrypted packets are then used to replace the unencrypted packets in the digital video signal to produce a partially encrypted video signal. The packets of the specified type can also be multiple encrypted and replaced in the data stream to produce a multiple encrypted video data stream.

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What is claimed is: 1. A method of partially dual encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice wherein the v

What is claimed is: 1. A method of partially dual encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice wherein the video slice contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; wherein, the first and second encrypted packets contain the same data when unencrypted; and replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal. 2. The method according to claim 1, wherein determining if the slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 3. The method according to claim 1, wherein determining if the slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 4. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 1. 5. The tangible computer readable storage medium of claim 4, wherein the medium comprises an electronic storage medium. 6. A method of partially encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice wherein the video slice contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal. 7. The method according to claim 6, wherein determining if the slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 8. The method according to claim 7, wherein determining if the slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 9. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 6. 10. The tangible computer readable storage medium of claim 9, wherein the tangible computer readable storage medium comprises an electronic storage medium. 11. A method of partially dual encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice wherein a preceding video slice contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; wherein, the first and second encrypted packets contain the same data when unencrypted; and replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal. 12. The method according to claim 11, wherein determining if a preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 13. The method according to claim 11, wherein determining if a preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 14. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 11. 15. The tangible computer readable medium of claim 14, wherein the medium comprises an electronic storage medium. 16. A method of partially encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice wherein a preceding video slice contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal. 17. The method according to claim 16, wherein determining if the preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 18. The method according to claim 16, wherein determining if the preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 19. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 16. 20. The tangible computer readable storage medium of claim 19, wherein the medium comprises an electronic storage medium. 21. A method of partially encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice header for a video slice that contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal. 22. The method according to claim 21, wherein determining if the slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 23. The method according to claim 21, wherein determining if the slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 24. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 21. 25. The tangible computer readable storage medium of claim 24, wherein the medium comprises an electronic storage medium. 26. A method of partially dual encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice header for a slice following a preceding video slice that contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; wherein, the first and second encrypted packets contain the same data when unencrypted; and replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal. 27. The method according to claim 26, wherein determining if a preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 28. The method according to claim 26, wherein determining if a preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 29. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 26. 30. The tangible computer readable storage medium of claim 29, wherein the medium comprises an electronic storage medium. 31. A method of partially encrypting a digital video signal, comprising: examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets carrying data representing a video slice header for a slice following a preceding video slice that contains a larger amount of data than a threshold amount of data; encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal. 32. A method according to claim 31, wherein determining if the preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of packets carrying the slice and determining if the number of packets is greater than a threshold number of packets. 33. The method according to claim 31, wherein determining if the preceding slice contains a greater amount of data than the threshold amount of data comprises counting a number of intra-coded macroblocks in the slice and determining if the number of intra-coded macroblocks is greater than a threshold number of intra-coded macroblocks. 34. A tangible computer readable storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 31. 35. The tangible computer readable storage medium of claim 34, wherein the medium comprises an electronic storage medium.