Abstract:
The present application relates to a method for editing and broadcasting compressed multimedia files composed of binary data blocks originating from digital transformations applied to an audiovisual or multimedia content according to the format of a parent file, said parent file having been separated into a first modified file having the format of the nominal parent file and into a complementary file including information on the modifications brought to the parent file, the method comprising prior to the transmission from a portal to the receiving terminal:
       a step of preparation including analyzing said first file for extracting time-codes therefrom,   a second step including generating an index register table from said first modified file,   a third step including generating a modified multimedia file according to the format of the parent file containing information of said first modified file and meta-data,   a step of transmission of said modified multimedia file separate from said modified multimedia file, the elements of said complementary file making it possible to recreate a partial synthesis of the original audiovisual file.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a National Phase Entry of International Application No. PCT/FR2007/001826, filed Nov. 6, 2007, which claims priority to French Application No. 0609664, filed Nov. 6, 2006. Both of these applications are incorporated by reference herein. 
     BACKGROUND AND SUMMARY 
     The present invention relates to the controlled editing and broadcasting of any audiovisual and multimedia file and content, by and to authorized users and provides a method and a system for the controlled editing and broadcasting of audiovisual and multimedia files and contents. 
     The general issue is to provide a device able to controllably diffuse compressed digital audiovisual and multimedia files of the MPEG type for video, JPEG type for still images or MP3 type for audio, to authorized users, and to enable them to edit said files by creating new audiovisual and multimedia files from one or several extracts of one or several independent audiovisual and multimedia files. With the present solutions, it is possible to transmit multimedia contents in a digital form via any network type. To avoid the hacking of thus diffused fluxes, said contents are often encrypted by various means which are well known to the persons skilled in the art. 
     However, the main drawback of the current solutions consists in that it is necessary to transmit not only the encrypted contents to the users, but also the decryption keys or the utilization licenses to the user terminal, so as to enable the execution of said contents. If the utilization licenses did not take into account the fact of being able to extract a predefined part of a content to edit it or to combine it with another predefined extract of the same, or of another content, after the encryption of the contents, this functionality cannot generally be performed. Thus, the present real time broadcasting solutions (streaming) or downloading solutions have major drawbacks such as the impossibility of editing said contents if they are protected by extremely efficient licenses or, on the contrary, they provide a malevolent user the possibility of making non authorized copies of the thus diffused contents if the encryption methods are not sufficient enough. Another drawback of the downloading is that it requires the complete downloading of the file even though a user wishes to see only one extract thereof, or start at another moment than the beginning of the file. 
     Under these conditions, a solution consists in separating the parent digital file into two parts, none of which could be used alone. With this idea in mind, several patents have been filed. Thus, it is known from document WO 01/69354 A3 (Microsoft Corporation) which discloses a system protecting a digital product (software or audio or video content using an encryption, by breaking it down into at least two portions. Both portions are encrypted after the separation and wholly and integrally transmitted to the user equipment through separate ways. The recombination of both parts on the receiving equipment is carried out using keys, which recreate a modified digital product which is substantially equivalent to the original product and which is appropriate only for this user equipment. This system recombines both parts to create a new digital product and thus cannot guarantee that said new digital product cannot be edited to make an extract thereof since the whole digital product is recreated by a given machine. This system does not allow the assembling of extracts either. 
     In the state of the art solutions are also known, making it possible to edit an audio file by dividing it into at least two segments and by retrieving therefrom one or several segments of the file. The application of patent WO 00/49597 was filed with this idea in mind and provides a method for encrypting data characterised in that it provides a set of sounds, retrieves one or several segments from the set to make a specific file, provides a decryption key, encrypts the specific file and communicates said encrypted specific file on a first communication channel and the retrieved segments on a second communication channel. The drawback of such a solution lies in the impossibility to control the utilization of the transmitted specific file. The lawful or fraudulent holder or the decryption key can use the file unconditionally and permanently. The issue of controlling the free flow of multimedia files on a network is not solved yet. 
     In order to remedy these various defects, the invention provides to enable the holder of rights to freely diffuse and to put on line his or her audiovisual and multimedia contents with maximum comfort and reading quality for the user of a terminal, independently from the rate of his or her connection to the telecommunication network. The invention also aims at enabling a user to read some extracts, to edit said extracts and to assemble them into a new audiovisual and multimedia file which can be broadcast within the limits of the holder&#39;s rights. 
     For this purpose, the invention relates to a method for editing and broadcasting compressed multimedia files composed of binary data blocks originating from digital transformations applied to an audiovisual or multimedia content according to a format of a parent file, said parent file having been divided into a first modified file having the format of the nominal parent file, and into a complementary file including information on the modifications brought to said parent file, characterised in that it includes, prior to the transmission from a portal to a receiving terminal:
         a step of preparation consisting in analyzing said first file to extract time-codes therefrom,   a second step consisting in generating an index register table from said first modified file,   a third step consisting in generating a modified multimedia file according to the format of the parent file containing information on said first modified file and meta-data,   a step of transmission:   of said modified multimedia file, and   by means separate from said multimedia file, the elements from said complementary file making it possible to recreate a partial synthesis of the original audiovisual file, from the calculations on the receiving terminal, as a function of said modified multimedia file and the elements of said complementary file.       

     Advantageously, the referencing of said complementary file is generated during said second step. Advantageously, said meta-data of said third step contain said time-codes from said step of preparation. Advantageously, said meta-data of said third step containing said referencing of said complementary file. Advantageously, said meta-data from said third step contain said index register table. 
     In a particular embodiment, the whole or a part of said modified multimedia file is sent by a portal. Advantageously, the whole or a part of said modified multimedia file is sent by another terminal. Advantageously, the whole or a part of said modified multimedia file is sent by a physical medium. 
     In another embodiment, said portal decides which elements of said complementary file are to be sent to said receiving terminal, as a function of the characteristics of said terminal. Advantageously, said portal decides which elements from said complementary file are to be sent to said receiving terminal, as a function of the utilization conditions imparted by the holder of the rights on said parent file. In a particular embodiment, said partial synthesis of the recreated content is executed upon reception of the first information of said modified multimedia file  34  and the first elements from said complementary file  33 . In another embodiment, said modified multimedia file is edited to create an extract of said modified multimedia file. 
     Advantageously, several extracts of modified multimedia files are assembled to create a new modified multimedia file. Advantageously, said extracts of modified multimedia files originate from only one modified multimedia file. Advantageously, said extracts of modified multimedia files originate from several modified multimedia files. 
     Eventually, the invention relates to a system for the transmission of a compressed audiovisual file for the implementation of the method, characterised in that it includes equipment for producing one modified multimedia file, at least equipment for operating an audiovisual flow between the production equipment and the operating equipment. Thus, the invention enables a total control of the utilization of copies and the conditions of utilization thereof, these conditions being imparted by the holder of rights on the parent content, of new files and audiovisual and multimedia contents thus broadcast or edited. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be better understood upon reading the description of a non limitative exemplary embodiment which follows, and referring to the appended drawings, wherein: 
         FIG. 1  describes the general architecture of a system for the implementation of a method according to the invention; 
         FIG. 2  describes the architecture of the portal according to the invention; and 
         FIG. 3  shows a particular embodiment of a receiving terminal according to the invention. 
     
    
    
     DETAILED DESCRIPTION 
     In  FIG. 1 , when the user of a terminal  1   i ,  1   j ,  1   k  wishes to see an audiovisual content, he/she makes a request to the portal  3  through the telecommunication network  2 . Said portal  3  then decides to send or not the complementary element corresponding to the corresponding audiovisual and multimedia content. 
     Prior to this phase, the parent audiovisual and multimedia content  31  has been prepared by the portal  3 , as shown in  FIG. 2 . Each audiovisual file  31  is shown in a compressed digital form and is composed of binary data blocks originating from digital transformations applied to an audiovisual and multimedia content according to the format of a parent file. The original format of a parent content  31  is for example a file with an original format MPEG-2, MPEG-4 or H264 for video or with an original format MP3 or AAC in the case of audio files, or in the original format JPEG in the case of still images or photographies files. 
     The parent content  31  is first divided into at least two parts, a first modified file of which  32  has the format of a nominal parent file and into a complementary file  33  having any format and including information on the modifications brought to said parent file  31 . The recreation of the parent file  31  can be done only from both files  32  and  33  and not from only one of them. 
     During a first step, said first modified file  32  is analyzed by the portal  3  so that the time-codes corresponding to the time indexes of the file  32  can be extracted. Advantageously, said parent file  31  is analyzed by the portal  3 , so that the time-codes corresponding to the time indexes of the file  32  can be extracted. 
     In a second step, said time-codes are combined with indexes or keywords, so as to generate an index register table  35 . This index register table  35  corresponds to a table of contents and includes for example a sequence of registers, each containing indexes and the time-code or time-codes of the beginning of the sequence in the modified file  32 , and consequently the beginning of the sequence in the modified multimedia file  34 . For example, if a portal  3  contains a set of animal films, one of the indexes of the index register table  35  is composed of a sequence of registers which “point” at all the parts of contents dealing with a given subject, for example “leopards”. The user of a terminal  1   i ,  1   j ,  1   k , etc. who wishes to see one or several films or extracts of films dealing with “leopards” will use this index register table  35  to have access to all the parts of contents dealing with “leopards”. In a third step, said time-codes extracted during the first step are noted in the meta-data of a new file called the modified multimedia file  34 . 
     In another embodiment, the referencing of said complementary file  33  is inscribed in said meta-data of said modified multimedia file  34 . The referencing of said complementary file  33  corresponds for example to the URL address in a portal  3  of said complementary file  33 . In another embodiment, said meta-data of said modified multimedia file  34  contain the conditions of utilization imparted by the holder of said parent file. Advantageously, said meta-data of said modified multimedia file  34  contain the conditions of utilization imparted by the holder of the rights on said parent file. Said holder is for example a broadcaster which holds the rights for the distribution and broadcasting of said parent file. 
     In another embodiment, said modified multimedia file  34  is a file of the HTML or XML type, which encapsulates said first modified file  32  and the time-codes corresponding to the time indexes of the file  32 . Advantageously, said index register table  35  is also encapsulated in said modified multimedia file  34 . In another embodiment, said modified multimedia file  34  is a file having the same format as the parent format of the modified file  32  and which contains said modified file  32  as well as said time-codes and the referencing of said complementary file  33  in its meta-data. Advantageously, said index register table  35  is also inscribed in said meta-data of said modified multimedia file  34 . 
     Following such steps of processing the multimedia contents, said modified multimedia files  34  are freely transmitted and broadcast to the terminals  1  through the telecommunication network  2 , via the interface  36 . Advantageously, said modified multimedia files  34  are freely transmitted and broadcast by any exchange network such as for example a community social or P2P network. Advantageously, said modified multimedia files  34  are freely transmitted and broadcast by physical media  4  such as for example DVDs, CD-ROMs, or any other memory of the USB or hard disk type, etc. Advantageously, said modified multimedia files  34  are freely transmitted and broadcast on one or several conventional audiovisual and multimedia servers  5 , so as to place said modified multimedia files  34  at the disposal of a great number of terminals  1 . 
     The multimedia contents are now available for the users  1   i ,  1   j ,  1   k,  etc. When the user of a terminal  1  wishes to see or listen to an audiovisual content, he or she conventionally logs in to the audiovisual server  5  through the network  2 . The user of the terminal  1  scrolls the menu via his or her interface  6 , he or she selects a content he or she wishes to consume and the modified multimedia file  34  corresponding to this film is transmitted by the server  5  to the terminal  1 . Said interface  6  is for example composed of a screen, loud speakers, a keyboard, a mouse etc. Said modified multimedia file  34  is recorded by the interface  14  in  FIG. 3  into the memory  10  composed of a hard disk or any other mass storage type. 
     As from the connection between said terminal  1  and said server  5 , the play-back unit  11  plays the meta-data of said modified multimedia file  34  and more particularly the referencing of said complementary file  33 . The terminal  1  then connects to the portal  3  in a client/server mode. Said portal  3  then checks that the user is authorized to consume said modified multimedia file  34  and act in such a way that the conditions of the utilization of the holder are complied with. The portal  3  then transmits, in a synchronized way, the elements of the complementary file  33  to the play-back unit  11  which recreates a partial synthesis of the original audiovisual file from the calculation on the receiver terminal  1 , as a function of said modified multimedia file  34  and the elements of said complementary file  33 . Said partial synthesis of the original audiovisual content is then displayed on the screen  6  via the interface  12 . 
     Advantageously, said partial synthesis of the recreated content is carried out as from the reception of the first information on said modified multimedia file  34  and the first elements from said complementary file  33 . Advantageously, said synthesis of the recreated content is recorded under the control of the portal  3  into the memory  10  of the terminal  1 . Advantageously, said synthesis of the recreated content is recorded under the control of the portal  3  on a physical medium  7  such as a DVD, a CD-ROM, a USB memory device, etc. 
     In a particular embodiment, the user requests the play-back unit  11  to save an extract of the content between two moments t 1 , t 2  which he/she marked through its interface  6 . The play-back unit  11  edits the meta-data and the time-codes of the beginning t 1  and the end t 2  of said extract, to record them into a new partial modified multimedia file  13  having the same characteristics as the original modified multimedia file  34 . Said new partial modified multimedia file  13  thus contains an extract of the original modified multimedia file  34  between times t 1  and t 2 . 
     Advantageously, the times t 1  and t 2  corresponding to the beginning and the end of the modified parent content  34 . Said new modified multimedia file  13  thus contains the whole of the parent modified multimedia file  34 . Advantageously, the partial synthesis of the recreated content between times t 1  and t 2  is recorded under the control of the portal  3  into the memory  10  of the terminal  1 . Advantageously, the partial synthesis of said content recreated between times t 1  and t 2  is recorded under the control of the portal  3 , on a physical medium  7  such as a DVD, a CD-ROM, a USB memory, etc. Advantageously, said modified multimedia file  13  is recorded on the physical medium  7  like a DVD, a CD-ROM, a USB memory, etc. 
     In another embodiment, the user requests to consume said modified multimedia file  34  only from time ti, said time t 1  having been selected by the user from the index register table  35  displayed on his or her screen  6 . Said user can thus immediately consume said audiovisual content without having to wait for the downloading of said modified multimedia file  34  from the beginning thereof until time ti. The portal  3  downloads to said user&#39;s terminal  1  only the part of the modified multimedia file  34  beginning at time ti up to time tj, as defined by the user&#39;s stop signal. In another embodiment, the user of a terminal  1  selects any time for the beginning of the viewing ti on a time-code scale. 
     When the user of the terminal  1  wishes to consume the content corresponding to said modified multimedia file  13 , his or her terminal is automatically connected to the portal  3  in a client/server mode. Said portal  3  checks that the user  1  is authorized to consume said modified multimedia file  13 , and acts in such a way that the holder&#39;s conditions of utilization are complied with. The portal  3  then transmits in a synchronized way the elements of the complementary file  33  to the play-back unit  11  which recreates the partial synthesis of the original audiovisual file from the calculation on the receiving terminal  1  as a function of the part of said modified multimedia file  13  and the elements of said complementary file  33  transmitted by said portal  3 . Said partial synthesis of the original audiovisual content is then displayed on the screen  6  via the interface  12 . 
     Advantageously, the partial synthesis of said recreated content is recorded under the control of the portal  3  into the memory  10  of the terminal  1 . Advantageously, the partial synthesis of the recreated content is recorded under the control of the portal  3  on a physical medium  7  like a DVD, a CD-ROM, a USB memory, etc. Advantageously, the whole or a part of said modified multimedia file  13  is recorded on a physical medium  7  like a DVD, a CD-ROM, a USB memory, etc. 
     In another embodiment, a user of the terminal  1   i  transmits a copy of the whole or a part of said modified multimedia file  13  to another terminal  1   j ,  1   k . In another embodiment, a user of a terminal  1  edits and assembles a set of modified multimedia files  13  for creating a new modified multimedia file  13 . Said new modified multimedia file  13  can then be used and broadcast like any other modified multimedia file  13 . 
     Advantageously, said modified multimedia files  13  thus edited and assembled are generated by the same modified multimedia file  34 . Advantageously, said modified multimedia files  13  which are thus edited and assembled originate from several modified multimedia files  34 . 
     The present invention is not limited to the preferred described implementation because of this characteristic and as shown in the appended Figures, but modifications can be brought or equivalents can be used without affecting the scope of the invention.