KR101424687B1 - Interoperable system and method for electronic book drm based on idpf epub standard - Google Patents

Abstract

The present invention relates to an electronic book DRM compatible system and method based on the EPUB standard of IDPF. More particularly, the present invention relates to an electronic book DRM compatible system, So that the compatibility of the e-book DRM client can be enhanced by allowing the heterogeneous e-book DRM client to browse various e-books including different DRMs sold by e-book sellers, and the format of the authentication key exchange method and the rights information It is possible to browse different kinds of electronic books only by communicating with the electronic book DRM server supporting the DRM corresponding to the different electronic book DRMs so that authentication and right information in the system information of electronic books purchased without the user's additional authentication procedure or operation procedure So that the convenience of browsing e-books is increased, and authentication The system information is generated through the sharing of the authentication key and the rights information between the e-book DRM server and the e-book DRM in which the format of the key exchange method and the rights information are different from each other, The authentication and the rights information can be updated and changed freely, thereby increasing the versatility of the electronic book reading.

Description

TECHNICAL FIELD [0001] The present invention relates to an electronic book DRM compatible system and method based on the EPUB standard of IDPF,

The present invention relates to an e-book DRM compatible system and method, and more particularly, to a system and method for e-book DRM compatible with e-book DRM, And more particularly, to an electronic book DRM compatible system and method based on the EPUB standard of IDPF supporting compatibility.

IDPF, which sets standards for formatting and copyright protection for e-books, announced EPUB 2.0.1 in September 2010 and EPUB 3.0 in October 2011. This standard includes methods for describing eBooks and methods for protecting the contents of eBooks.

1 is a block diagram of a general IDPF EPUB standard electronic book 500. Referring to FIG. 1, a method for protecting an electronic book in an EPUB of IDPF is described as an encryption notation method, an electronic signature notation, a rights expression notation , Which correspond to the encryption.xml (511), signatures.xml (513), and rights.xml (512) files, respectively, of the EPUB element. The EPUB standard is intended to conform to the W3C XML standard as an internal notation for encryption.xml (511) and signatures.xml (513), but rights.xml (512) does not specify a specific standard for internal notation, (rights.xml).

In general, when considering the IDPF EPUB standard, compatibility between various e-book DRM viewers and e-book DRM contents will be guaranteed. The e-book DRM key exchange method differs for each service company, (520: rights.xml), it is difficult to ensure compatibility between the system information 510 and the free reading 520 of the e-book content 520 is limited.

In more detail, the encryption key 1 of the content 520 transmitted through the encryption.xml 511 is a public key or a secret key due to the standard characteristics of W3C Encryption XML, which is an internal notation standard of the encryption.xml 511 In particular, when DRM of a specific service provider encrypts and transmits a content encryption key (1) using a secret key, information on the secret key is transmitted only to a corresponding DRM provider (521) through disclosure of the key management method can not be guaranteed because it can not be secretly managed and disclosed.

In addition, even if the public key-based encryption key storage method is not available, compatibility with the public key can not be expected when the public key is not agreed upon.

FIG. 2 is a structural view of a different type of electronic book DRM which is incompatible due to the above-mentioned reasons. As shown in the figure, although a plurality of DRM companies use the same EPUB standard, And the information notation methods are different from each other and can not be compatible.

2, an electronic book DRM client A 300 that wants to browse the electronic book A 500 transmitted from the electronic book DRM server A 200 receives the encryption 1 from the system information 510 of the electronic book A 500 (511) decrypts K _cek using the secret key known by itself, and also obtains the rights information from rights1.xml 512 based on the right information format F1 that he knows.

The e-book DRM client A 300 can decrypt and view the content 1 520 using the K _cek after confirming the right to access the content based on the information.

In this case, the key delivery method used in the DRM system composed of the e-book DRM client A 300 and the e-book DRM server A 200 is a secret key method, and the e-book DRM client A 300 ), But the methods (511, 513) for processing the secret key can not be disclosed. Therefore, in the DRM system in which the methods 611, 612 are composed of the public key based e-book DRM server B and the e-book DRM client B I can not read it.

Although the format 1 is used to represent the right information in the electronic book A 500, the system information 610 format 2 composed of the system information 610 different from the format 1 and the format 612 of the right information is used The contents 620 of the electronic book B composed of the format 2 can be read but the contents of the electronic book A 500 composed of the format 1 can not be interpreted and thus compatibility is practically impossible.

Korean Patent No. 10-0718702

It is an object of the present invention to remedy the above-mentioned problems by allowing an e-book DRM client to replace an incompatible electronic book with only system information while observing the EPUB standard of IDPF, The present invention provides an e-book DRM compatible system and method based on the EPUB standard of IDPF, which enables various e-books including different DRMs to be sold to be viewed.

Another object of an embodiment of the present invention to solve the above problems is to provide an electronic book DRM server that supports DRM of the electronic book DRM having different formats of the authentication key exchange method and the rights information, Thereby enabling an e-book DRM compatible system and method to be browsed by only authentication and right information in the system information of purchased e-book without an additional authentication procedure or operation procedure of the user.

It is still another object of the present invention to solve the above-described problems, and it is an object of the present invention to provide an e-book DRM authentication method in which e-book DRM authentication keys and rights information are formatted differently, And DRM compatible system and method in which renewal and modification of authentication and rights information between servers using different types of e-book DRMs are freely made.

According to an aspect of the present invention, there is provided an electronic book DRM (Digital Rights Management) compatible system based on EPUB standard of IDPF according to an embodiment of the present invention includes an electronic book And an e-book DRM server for supporting the format of the second system information in a format different from the format of the first system information, wherein the e-book DRM server authenticates the e-book DRM client A system information management unit for managing the format of the second system information and the format of the first system information in association with each other, and a second system information management unit for managing the second system information received from the e-book DRM client, A system for updating the first system information in the format of the first system information and transmitting the updated system information to the e-book DRM client A system information extracting unit for extracting the second system information from the e-book when the e-book DRM client attempts to browse the e-book composed of the second system information and can not browse the e-book, A second system information transmitting unit for receiving the first system information corresponding to the e-book from the e-book DRM server and transmitting the second system information to the second e-book DRM server, A system information replacement unit for replacing the system information with the first system information, a right information format processing unit for processing the format of the right information included in the replaced first system information to obtain the right information, And an electronic book reading unit for reading the electronic book using the electronic book reading unit.

The first system information and the second system information differ from each other by at least one of an authentication key exchange scheme and a format of rights information.

In addition, the first system information and the second system information preferably include encryption.xml, rights.xml, and signatures.xml in the electronic book.

Wherein the system information update unit of the e-book DRM server receives from the external e-book DRM server supporting the first system information of the e-book DRM client a first right information format corresponding to the format of the first system information, And shares a first public key for encrypting the first system information.

The system information update unit of the electronic book DRM server stores the encrypted content key of the electronic book in the encryption.xml through the first public key and stores the right information of the corresponding electronic book changed using the first right information format In right.xml.

The authentication unit of the e-book DRM client decrypts the encrypted content key of the encryption.xml encrypted with the first public key with a first secret key corresponding to the first public key.

The system information update unit of the e-book DRM server may renew the electronic signature of the updated encyption.xml and rights.xml of the e-book and store it in signatures.xml.

The system information update unit of the e-book DRM server may add the first system information while maintaining the second system information existing in the encryption.xml, rights.xml, and signatures.xml.

When the system information extracting unit of the e-book DRM client has a plurality of pieces of system information through encryption.xml, rights.xml, and signatures.xml at the time of reading the e-book, Or to check if there is information that can be read.

According to another aspect of the present invention, there is provided an electronic book DRM compatible method of an electronic book DRM compatible system based on the EPUB standard of an IDPF, Extracting the second system information from the electronic book if the e-book DRM client supporting the reading of the e-book is unable to browse the e-book configured by the second system information, The e-book DRM server supporting different format of the second system information manages the format of the second system information and the format of the first system information in association with each other, And transmitting the second system information extracted and authenticated to the e-book DRM server, Updating the second system information received from the client to the format of the first system information and transmitting the updated second system information to the DRM client of the DRM agent; receiving, from the DRM server, 1 system information and replacing the second system information of the e-book with the first system information, processing the format of the rights information included in the first system information replaced by the e-book DRM client, And reading the e-book using the replaced first system information by the e-book DRM client.

The extracting step checks whether the e-book DRM client has a key that can be read from the second system information of the e-book, and checks whether the second system information of the e-book has readable right information.

The first system information and the second system information are different in the format of the authentication key exchange scheme or the rights information.

In this case, the first system information and the second system information preferably include both encryption.xml, rights.xml, and signatures.xml in the electronic book.

Wherein the format management step comprises: a first right information format corresponding to a format of the first system information from the external e-book DRM server supporting the first system information of the e-book DRM client; It is preferable to share a first public key for encrypting the first system information.

The e-book DRM compatible system and method based on the EPUB standard of the IDPF according to the embodiment of the present invention allows the e-book DRM client to observe the EPUB standard of the IDPF, The compatibility of the e-book DRM client can be greatly enhanced by allowing a heterogeneous e-book DRM client to browse various e-books including different DRMs sold by e-book sellers.

An e-book DRM compatible system and method based on the EPUB standard of the IDPF according to an embodiment of the present invention includes an e-book DRM server supporting the corresponding DRM for e-book DRMs having different authentication key exchange schemes and different rights information formats It is possible to browse different kinds of electronic books with communication only, so that it is possible to read only the authentication and the right information in the system information of the purchased electronic book without user's additional authentication procedure or operation procedure, .

The e-book DRM compatible system and method based on the EPUB standard of the IDPF according to the embodiment of the present invention is also applicable to the electronic book DRM authentication key and rights information The system information is generated and transmitted through the format sharing of the e-book DRM, so that the authentication and the right information update and change between the servers using different types of e-book DRMs are free.

1 is a structural view of a general IDPF EPUB standard electronic book.
2 is a structural view of an incompatible heterogeneous electronic book DRM;
3 is a block diagram of an electronic book DRM compatible system based on EPUB standard of IDPF according to an embodiment of the present invention.
FIG. 4 is a structural view of a heterogeneous electronic book DRM compatible with an electronic book DRM compatible system based on the EPUB standard of IDPF according to an embodiment of the present invention; FIG.
5 is a data flow diagram of a method of compatibility of an electronic book DRM compatible system based on the EPUB standard of IDPF according to an embodiment of the present invention.
6 is a flowchart of DRM e-book reading in an e-book DRM client according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

3 is a block diagram of an e-book DRM compatible system based on the EPUB standard of IDPF according to an embodiment of the present invention.

An electronic book DRM (Digital Rights Management) compatible system based on the EPUB standard of the IDPF according to an embodiment of the present invention includes an electronic book 700 supporting the reading of the electronic book 700 configured in the format of the first system information 710 The e-book DRM server 200 supports the format of the DRM client 100 and the second system information 510 having a different format from the first system information 710, An authentication management unit 210 for mutually authenticating the e-book DRM client 100 and receiving the second system information 510 from the e-book DRM client 100, The system information manager 220 manages the first system information 710 in correspondence with the format of the first system information 710 and the second system information 510 received from the e-book DRM client 100, Format so that the electronic book DR M client 100. The e-book DRM client 100 attempts to browse the e-book 500 composed of the second system information 510, The system information extracting unit 120 extracts the second system information 510 from the corresponding electronic book 500 if it is not possible, the second system information 510 extracted by mutual authentication with the electronic book DRM server 200 The first system information 710 corresponding to the e-book 500 is received from the e-book DRM server 200 and transmitted to the e-book DRM server 200, A system information replacing unit 140 for replacing 70 the first system information 510 of the first system information 710 with the first system information 710, A right information format processing unit 130 for processing the format of the first information and obtaining the right information, Using the system information 710 comprises the electronic book 700, the view 720, the electronic book yeolrambu 150 for.

The e-book DRM client 100 and the electronic book DRM server 200 communicate with each other via the respective communication units 160 and 240.

The electronic book DRM compatible system based on the EPUB standard of the IDPF according to an embodiment of the present invention provides a method of unifying the key delivery methods of the electronic book DRM and processing a plurality of rights information, DRM contents provided by various DRM service providers through a method of ensuring security even if they are compatible with each other through an e-book DRM client In order to make it possible to read incompatible electronic books while obeying the EPUB standard of the IDPF, only the system information can be read, so that various kinds of electronic books including different DRMs sold by e-book sellers can be browsed in the heterogeneous electronic book DRM client, Thereby increasing the compatibility of book DRM clients.

The first system information 710 and the second system information 510 differ from each other in at least one of the authentication key exchange method and the format of the rights information.

In addition, the first system information 710 and the second system information 510 preferably include both the encryption.xml 511 and 711, the rights.xml 512 and 712, and the signatures.xml 513 and 713 in the electronic book .

The system information updating unit 230 of the e-book DRM server 200 includes an external e-book DRM server 400 that supports the first system information 710 of the e-book DRM client 100, A first rights information format 712 corresponding to the format of the first system information 710 and a first public key for encrypting the first system information 710 can be shared.

The system information update unit 230 of the electronic book DRM server 200 stores the encrypted content key of the electronic book in the encryption.xml 711 via the first public key, ) Format and stores the rights information of the corresponding electronic book 700 in the right.xml 712. [

At this time, the authentication unit 110 of the e-book DRM client 100 decrypts the encrypted content key of the encryption.xml 711 encrypted with the first public key with the first secret key corresponding to the first public key do.

The system information update unit 230 of the e-book DRM server 200 newly renews the electronic signature of the updated encyption.xml 711 and rights.xml 712 of the electronic book, (713).

The system information update unit 230 of the e-book DRM server 200 deletes the second system information 510 existing in the encryption.xml 711, rights.xml 712, and signatures.xml 713, The first system information 710 may be added while maintaining the first system information 710.

In this case, the system information extracting unit 120 of the e-book DRM client 100 accesses the electronic book through the encryption.xml 711, rights.xml 712, and signatures.xml 713 If there is a plurality of pieces of system information, it is possible to check whether or not there is a key that can be browsed in each system information or to check whether or not there is the right information to be read.

Referring again to FIG. 3, in order to browse the electronic book A 500 transmitted from the electronic book DRM server A 200 in the two electronic book DRM clients 300 and 100 having different system information formats according to the embodiment of the present invention (Encryption.xml, rights.xml, signatures.xml) of the e-book will be described as follows.

Electronic book DRM client A (300), after decrypting the K _cek that is encrypted with the public key K _pub1 in encryption1.xml (511) using the private key K _pri1 for the electronic book A (500), this key The encrypted content C1 520 can be decrypted and read.

At this time, since the e-book DRM client A (300) uses the F1 method (512) as the rights information expression format, the e-book DRM client A (300) There is no problem in verifying whether or not the right information A included is authorized to view (520) the electronic book 500 by inquiring.

However, when the e-book DRM client B 100, which is completely different from the DRM system, wants to browse the electronic book A 500, it decrypts K _cek using the private key K _pri2 held by the e-book DRM client B 100 And the e-book DRM client B (100) uses the right information format F2 (712) and can not interpret the right information format F1.

Accordingly, the e-book DRM client B 100 receives the update information on the system information about the electronic book A 500 through the e-book DRM server A 200 that transmitted the e-book A 500, It is necessary to verify whether or not the book (500) has the right to read. The detailed procedure for updating the system information is described in Fig.

The electronic book A '700 in which the system information has been updated _exists in the encryption2.xml 711 that can be decrypted using the private key K _pri2 held by the electronic book DRM client B 100, Since the right information composed of F2 also exists in the rights2.xml 712, the content C1 720 can be browsed.

At this time, the electronic book A '700 has system information 710 that can be browsed both in the electronic book DRM client A 300 and the electronic book DRM client B 100, 300, and 100).

As described above, the e-book DRM compatible system based on the EPUB standard of the IDPF according to the embodiment of the present invention is also applicable to the e-book DRM with different authentication key exchange method and right information format, It is possible to freely update and change authentication and rights information between servers using different types of e-book DRMs, thereby greatly increasing the versatility of reading e-books. .

Preferably, the e-book DRM server A 200 newly adds a content key encrypted with a public key based encryption method to the existing key using the certificate of the requested e-book DRM client 100, (711).

At this time, the e-book DRM server A 200 newly adds the existing rights information using the right information format F2 that can be processed by the requested e-book DRM client 100, and adds it to the rights2.xml 200 .

Also, it is preferable that the electronic book DRM server A 200 newly renews the digital signature for the updated encryption2.xml 711 and rights2.xml 712 and stores it in the signatures2.xml 713. [

As a preferred embodiment, the e-book DRM server A (200) includes an e-book DRM server B (400) using an authentication key exchange method and a rights information format F2 of the e-book DRM client B (100) If the e-book DRM server has exchanged the certificates for the e-book DRM server by mutual e-book DRM clients or mutual e-book DRM servers in the case where the mutual protocols are used, It is preferable to update the system information so as to be compatible with each other.

FIG. 4 is a block diagram of a heterogeneous electronic book DRM compatible with an electronic book DRM compatible system based on the EPUB standard of IDPF according to an embodiment of the present invention. Referring to FIG. 4, an electronic book readable only by the DRM client A 300 is called a DRM The process of updating the system information 511, 512, 513 in the electronic book 500 (711, 712, 713) by the electronic book DRM server A (200) It is.

3 and 4, the e-book DRM client B 100 acquires system information (e. G., Information) from the e-book 500 in order to view the e-book 500, 511, 512, 513) and requests the e-book DRM server A 200 that has sold the electronic book 500 to update the system information 710.

The electronic book DRM server A (200) is added to the K _cek using the public key K _pub2 to be read in the electronic book DRM client B (100) to encryption2.xml (711) and, rights2 the right information composed of format F2. xml 712, and newly renews the digital signature in the changed encryption2.xml 711 and rights2.xml 712, and sends it down again.

At this time, the e-book DRM client B 100 can browse the e-books 700 and 720 after replacing the updated system information 710 with the system information 511, 512, and 513 of the existing e-book.

As described above, the e-book DRM compatible system based on the EPUB standard of the IDPF according to the embodiment of the present invention includes an e-book DRM server supporting the corresponding DRM for e-book DRMs having different authentication key exchange schemes and different rights information formats It is possible to browse different types of electronic books by communication alone, and it is possible to view only the authentication and the right information in the system information of purchased e-book without additional authentication procedure or operation procedure of the user, thereby increasing the convenience of reading electronic books.

FIG. 5 is a data flow diagram of a method of completing an electronic book DRM compatible system based on the EPUB standard of the IDPF according to an embodiment of the present invention. In the electronic book DRM client 100, And a protocol for requesting an update 710 to the system information 510.

Referring to FIG. 5, the e-book DRM client B 100 notifies the e-book DRM server A 200 of the start of information update of the e-book DRM client B 100 through the start steps S10 and S20, In the authentication step (S30, S40), a trusted method is used to exchange trusted certificates.

In the mutual authentication step (S30, S40), even if the e-book DRM client B (100) and the e-book DRM server (A) 100 using different DRM schemes agree on business compatibility, If the server certificate is exchanged and stored, if the request is received, the issuer of the client certificate is inquired and the information renewal request is granted in case of the agreed certificate issuer.

The electronic book DRM client B 100 transmits the existing electronic book system information 510 and receives the updated electronic book system information 710 in the system information update requesting step S50 and S60.

The secure certificate exchange method used in the mutual authentication step (S30, S40) may use a PKI (Public Key Infrastracture) method based on X.509 standard.

Also, upon request of the system information update 710, the user's ID and password may be transmitted for user authentication to the electronic book service site. At this time, the password is preferably encrypted by encrypting the hashed value for security .

FIG. 6 is a flowchart illustrating a DRM e-book reading process in an e-book DRM client according to an exemplary embodiment of the present invention. In order to support compatibility in an e-book DRM client, FIG.

An e-book DRM compatible method of an e-book DRM compatible system based on the EPUB standard of the IDPF according to an embodiment of the present invention includes an electronic book (S100, S110, S120, and S130) of extracting the second system information from the electronic book if the DRM client attempts to browse the e-book configured with the second system information and is not browsable, (S140) of managing an e-book DRM server supporting a format of a second system information having a different format by associating a format of the second system information with a format of the first system information (S140) (S140) of transmitting the second system information extracted by mutual authentication with the book DRM server to the e-book DRM server (S140), the e-book DRM server (S150) of updating the second system information received from the e-book DRM server to the format of the first system information and transmitting the updated second system information to the e-book DRM client (S160, S170) of receiving the first system information from the first system information and replacing the second system information of the e-book with the first system information (S180, S190) of acquiring rights information by processing the format of the information, and browsing the electronic book using the replaced first system information by the e-book DRM client (S180, S190).

The extraction step (S130) checks whether the e-book DRM client has a key that can be read from the second system information of the electronic book, and checks whether there is readable right information in the second system information of the electronic book (S120 )do.

The first system information and the second system information differ from each other in at least one of an authentication key exchange scheme or a format of rights information.

In this case, the first system information and the second system information preferably include both encryption.xml, rights.xml, and signatures.xml in the electronic book.

Wherein the format management step comprises: a first right information format corresponding to a format of the first system information from the external e-book DRM server supporting the first system information of the e-book DRM client; It is preferable to share a first public key for encrypting the first system information.

6, the e-book DRM client checks whether there is a key available for its DRM client from the e-book that can be read by another DRM client, and if it is not present, extracts the system information, .

In addition, it is checked whether there is the right information that can be interpreted by the DRM client of the user or whether the user has the right to use the content. If not, the system information is extracted and the update is requested to the e-book DRM server.

When the system information is successfully received from the e-book DRM server, the e-book DRM client replaces the existing system information with the system information of the existing e-book to read the e-book.

The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. However, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention. .

100: e-book DRM client B 110: authentication unit
120: system information extracting unit 130: right information format processing unit
140: system information replacement unit 150: electronic book reading unit
160: communication unit 200: electronic book DRM server A
210: authentication management unit 220: system information management unit
230: System information update unit 240:
300: e-book DRM client A 400: e-book DRM server B
500,600: IDPF EPUB Standard eBook 510,610: System Information
520,620: Content of IDPF EPUB standard ebook
700: IDPF EPUB standard ebook with system information replaced or updated
710: Replaced or updated system information
720: Content of IDPF EPUB standard ebook with system information replaced or renewed

Claims (9)

In an e-book DRM (Digital Rights Management) compatible system based on the EPUB standard of IDPF,
An electronic book DRM client for supporting reading of an electronic book configured in a format of first system information;
And an e-book DRM server supporting a format of second system information in a format different from the first system information,
The e-book DRM server
An authentication manager for authenticating the e-book DRM client and transmitting the second system information from the e-book DRM client,
A system information management unit for managing the format of the second system information and the format of the first system information in association with each other,
And a system information updating unit for updating the second system information received from the e-book DRM client to the format of the first system information and transmitting the updated second system information to the e-book DRM client,
The e-book DRM client
A system information extracting unit for extracting the second system information from the electronic book if it is impossible to browse by attempting to browse the electronic book composed of the second system information,
An authentication unit for transmitting the extracted second system information to the electronic book DRM server by mutually authenticating the electronic book DRM server,
A system information substitution unit that receives the first system information corresponding to the electronic book from the electronic book DRM server and replaces the second system information of the electronic book with the first system information,
A rights information format processor for processing the format of rights information included in the substituted first system information to obtain rights information;
And an electronic book reading unit for reading the electronic book using the substituted first system information,
The system information update unit of the e-book DRM server
A first right information format corresponding to a format of the first system information and a second right information format corresponding to a format of the first system information from an external e-book DRM server supporting the first system information of the e-book DRM client, Stores the encrypted content key of the electronic book in the encryption.xml through the first public key, and stores the right information of the changed electronic book in the right.xml using the first rights information format Ebook DRM compatible system based on the EPUB standard of IDPF.
2. The method of claim 1, wherein the first system information and the second system information
An authentication key exchange method, and a format of rights information are different from each other, based on the EPUB standard of IDPF.
2. The method of claim 1, wherein the first system information and the second system information
An electronic book DRM compatible system based on the EPUB standard of IDPF, which includes both encryption.xml, rights.xml, and signatures.xml in the e-book.
delete delete The e-book DRM client according to claim 1, wherein the authentication unit of the e-book DRM client
And decrypting the encrypted content key of the encryption.xml encrypted with the first public key with a first secret key corresponding to the first public key, based on the EPUB standard of the IDPF.
In an e-book DRM compatible method of an e-book DRM (Digital Rights Management) compatible system based on the EPUB standard of IDPF,
a) an e-book DRM client supporting reading an e-book configured in the format of the first system information attempts to browse an e-book composed of the second system information and extracts the second system information from the e- ;
b) managing an e-book DRM server supporting a format of a second system information having a different format from the first system information by associating the format of the second system information with the format of the first system information;
c) transmitting the second system information extracted and extracted by the e-book DRM client to the e-book DRM server, to the e-book DRM server;
d) the e-book DRM server updates the second system information received from the e-book DRM client to the format of the first system information and transmits the updated second system information to the e-book DRM client;
e) receiving the first system information corresponding to the e-book from the e-book DRM server, and replacing the second system information of the e-book with the first system information;
f) processing the format of the rights information included in the first system information in which the e-book DRM client is substituted to obtain rights information;
g) browsing the electronic book using the first system information that the e-book DRM client has replaced;
The step b)
Wherein the e-book DRM server receives a first right information format corresponding to a format of the first system information and a second right information format corresponding to a format of the first system information from an external e-book DRM server supporting the first system information of the e-book DRM client And stores the encrypted content key of the electronic book in the encryption.xml through the first public key and stores the rights information of the corresponding electronic book changed using the first rights information format right. The EPM standard of IDPF is based on an e-book DRM compatible system.
8. The method of claim 7, wherein step a)
Wherein the e-book DRM client checks whether there is a key that can be read from the second system information of the e-book, and checks whether there is readable right information in the second system information of the e-book. DRM compatible method of e - book DRM compatible system based on e - book.
delete

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