Container agnostic decryption device and methods for use therewith

Patent metadata

Field	Value
Publication number	US-9641322-B2
Application number	US-201514617653-A
Country	US
Kind code	B2
Filing date	Feb 9, 2015
Priority date	Feb 8, 2012
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A video processing device for decrypting a compressed video signal includes a key storage device for storing at least one decryption key. An decryption processing device retrieves the at least one decryption key from the key storage device, and decrypts an encrypted elementary bit stream into at least one elementary bit stream, wherein first portions of the encrypted elementary bit stream are encrypted and second portions of the encrypted elementary bit stream are unencrypted.

First claim

What is claimed is:

1. A video processing device for decrypting a compressed video signal from at least one partially encrypted elementary bit stream, the video processing device comprising:
a machine that includes:
a key storage device for storing at least one decryption key; and
a decryption processing device, coupled to the key storage device, that retrieves the at least one decryption key from the key storage device, that segments the at least one partially encrypted elementary bit stream into a plurality of blocks, wherein segmenting the plurality of blocks includes separating the plurality of blocks into a first subset of blocks of standard length and a second subset of blocks of non-standard length, and that decrypts at least one partially encrypted elementary bit stream into a decrypted elementary bit stream, by applying a first of a plurality of decryption methods for decrypting each of the first subset of blocks of standard length and applying a second of the plurality of decryption methods for decrypting each of the second subset of blocks of non-standard length separately from the first subset of blocks of standard length;
wherein first portions of the at least one partially encrypted elementary bit stream are encrypted and second portions of the at least one partially encrypted elementary bit stream are unencrypted.

2. The video processing device of claim 1 wherein the decryption processing device includes:
a decryption module, coupled to the bit stream segmenter, that decrypts the plurality of blocks into a plurality of decrypted blocks based on the at least one decryption key; and
an output formatter, coupled to the decryption module, that generates the decrypted elementary bit stream from the plurality of decrypted blocks.

3. The video processing device of claim 1 wherein the second subset of blocks includes a remainder block.

4. The video processing device of claim 1 wherein the decrypted elementary bit stream includes an elementary audio bit stream and an elementary video bit stream.

5. The video processing device of claim 1 further comprising:
an interface module, coupled to the decryption processing device, that de-encapsulates the at least one partially encrypted elementary bit stream from a container format.

6. The video processing device of claim 1 further comprising:
an interface module, coupled to the decryption processing device, that encapsulates and encrypts the decrypted elementary bit stream into an encrypted container format.

7. The video processing device of claim 1 further comprising:
a video decoder, coupled to the decryption processing device, that decodes the decrypted elementary bit stream to produce an uncompressed video signal.

8. The video processing device of claim 1 further comprising:
an encryption processing device, coupled to the key storage device, that retrieves at least one encryption key from the key storage device, and that encrypts the decrypted elementary bit stream into a transcrypted elementary bit stream.

9. The video processing device of claim 1 further comprising:
a video transcoder, coupled to the decryption processing device, that transcodes the decrypted elementary bit stream to produce at least one transcoded elementary bit stream.

10. The video processing device of claim 9 further comprising:
an encryption processing device, coupled to the video transcoder, that retrieves at least one encryption key from the key storage device and that encrypts the at least one transcoded elementary bit stream into a transcoded encrypted elementary bit stream.

11. A method for decrypting a compressed video signal from at least one partially encrypted elementary bit stream, the method comprising:
a machine that includes:
storing at least one decryption key in a key storage device; and
executing instructions via a processor to:
retrieve the at least one decryption key from the key storage device;
segment the at least one partially encrypted elementary bit stream into a plurality of blocks, wherein segmenting the plurality of blocks includes separating the plurality of blocks into a first subset of blocks of standard length and a second subset of blocks of non-standard length; and
decrypt at least one partially encrypted elementary bit stream into a decrypted elementary bit stream, by applying a first of a plurality of decryption methods for decrypting each of the first subset of blocks of standard length and applying a second of the plurality of decryption methods for decrypting each of the second subset of blocks of non-standard length separately from the first subset of blocks of standard length;
wherein first portions of the at least one partially encrypted elementary bit stream are encrypted and second portions of the at least one partially encrypted elementary bit stream are unencrypted.

12. The method of claim 11 wherein decrypting the at least one partially encrypted elementary bit stream includes:
decrypting the plurality of blocks into a plurality of decrypted blocks based on the at least one decryption key; and
generating the decrypted elementary bit stream from the plurality of decrypted blocks.

13. The method of claim 12 wherein the second subset of blocks includes a remainder block.

14. The method of claim 11 wherein the decrypted elementary bit stream includes an elementary audio bit stream and an elementary video bit stream.

15. The method of claim 11 further comprising:
de-encapsulating the at least one partially encrypted elementary bit stream from a container format.

16. The method of claim 11 further comprising:
encapsulating and encrypting the decrypted elementary bit stream into an encrypted container format.

17. The method of claim 11 further comprising:
decodes the decrypted elementary bit stream to produce an uncompressed video signal.

18. The method of claim 11 further comprising:
retrieving at least one encryption key from the key storage device; and
encrypting the decrypted elementary bit stream into a transcrypted elementary bit stream.

19. The method of claim 11 further comprising:
transcoding the decrypted elementary bit stream to produce at least one transcoded elementary bit stream.

20. The method of claim 19 further comprising:
retrieving at least one encryption key from the key storage device; and
encrypting the at least one transcoded elementary bit stream into a transcoded encrypted elementary bit stream.

Assignees

• Vixs Systems Inc

Inventors

• Ducharme Paul D

Classifications

• H04N21/64715

  Protecting content from unauthorized alteration within the network (verifying the information received for network security in communication control or processing H04L63/12; integrity in wireless network security H04W12/10) · CPC title

• H04N21/44055

  by partially decrypting, e.g. decrypting a video stream that has been partially encrypted · CPC title

• H04N21/4181

  for conditional access · CPC title

• H04N21/23476

  by partially encrypting, e.g. encrypting the ending portion of a movie · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title