Method and apparatus for reproducing compressed media content

Abstract

A data file reproduction system has a data file supplying apparatus that extracts video data and audio data from a received data file, compresses the extracted video and audio data and produces a compressed data file containing the compressed audio and video data together with meta or navigation data determined from the data file for enabling navigation of the original data file. The compressed data file is then copy-protected. Upon request, the copy-protected compressed data file is communicated to a reproduction apparatus which decompresses the compressed audio and video data of the received copy-protected compressed data file, encodes the decompressed audio and video data and produces a copy-protected reconstituted data file containing the encoded audio and video data together with the meta or navigation data determined from the copy-protected compressed data file, so enabling navigation of the copy-protected reconstituted data file, the same as the original data file.

1 - 19 . (canceled) 
     
     
         20 . A reproduction apparatus comprising:
 a video data decompressor operable to decompress compressed video data of a copy-protected compressed data file in a DVD-like proprietary format, using a first decompression format;   an audio data decompressor operable to decompress compressed audio data of the copy-protected compressed data file using a second decompression format different than the first decompression format;   a video data encoder operable to encode the decompressed video data in DVD format;   an audio data encoder operable to encode the decompressed audio data;   a navigation data determiner operable to determine non-compressed meta navigation data from the copy-protected compressed data file wherein the meta data includes a mapping between video and audio data packs in the received DVD-like format file and the decompressed video and audio data and is sufficient to reconstitute the decompressed video data including inserted padding data; and   a data assembler operable to produce a copy-protected reconstituted DVD format data file using the meta data containing the encoded audio and video data together with the determined meta navigation data for enabling navigation of the copy-protected reconstituted data file.   
     
     
         21 . An apparatus according to  claim 20 , further comprising a data decrypter operable to decrypt an encrypted file using a decryption key. 
     
     
         22 . An apparatus according to  claim 20 , further comprising a compressed data file play enabler operable to enable a data file player to play a compressed data file. 
     
     
         23 . An apparatus according to  claim 20 , further comprising a data file recorder operable to record the copy-protected data file on a recording medium. 
     
     
         24 . An apparatus according to  claim 20 , wherein the data assembler is operable to produce a copy-protected reconstituted data file only in the event that a supplying apparatus indicates that the reproduction apparatus is authorised to produce a copy-protected reconstituted data file. 
     
     
         25 . An apparatus according to  claim 20 , further comprising an authenticator operable to authenticate the data assembler and to permit production of a copy-protected reconstituted data file only in the event that the authenticator authenticates the data assembler. 
     
     
         26 . An apparatus according to  claim 20 , wherein the audio and video data decompressors are operable to decompress compressed data packs and the audio and video data encoders are operable to encode the decompressed data packs in the DVD format. 
     
     
         27 . (canceled) 
     
     
         28 . A method of reproducing a data file, the method comprising:
 receiving a compressed data file in a DVD-like proprietary format comprising compressed audio and video data and non-compressed meta data for enabling navigation of the data file from which the compressed data file was produced;   storing the compressed data file in a non-volatile data storage;   determining from licence information associated with the compressed data file whether decompression of the compressed data file is allowed and in the event that decompression is allowed:   decompressing the compressed video data of the copy-protected compressed data file using a first decompression format,   decompressing the compressed audio data of the copy-protected compressed data file using a second decompression format different than the first decompression format,   encoding the decompressed video data in DVD format,   encoding the decompressed audio data,   obtaining the non-compressed meta data from the copy-protected compressed data file, and   producing a copy-protected reconstituted data file containing the encoded audio and video data together with the obtained meta data for enabling navigation of the copy-protected reconstituted data file in the same manner as the original data file wherein the meta data includes a mapping between video and audio data packs in the received DVD-like format file and the decompressed video and audio data and is sufficient to reconstitute the decompressed video data including inserted padding data.   
     
     
         29 . A method according to  claim 28 , wherein the compressed data file contains copy protection control data for ensuring that the produced reconstituted data file is copy-protected. 
     
     
         30 . A method according to  claim 28 , further comprising recording the copy-protected data file on an optical recording medium to produce a copy-protected recorded optical recording medium. 
     
     
         31 - 34 . (canceled) 
     
     
         35 . A non-transitory computer readable medium comprising processor-executable instructions for causing a processor to carry out a method in accordance with  claim 28 . 
     
     
         36 - 37 . (canceled)