KR20160038164A

KR20160038164A - PayTV management method using UHD TV feature and Gateway thereof

Info

Publication number: KR20160038164A
Application number: KR1020140130264A
Authority: KR
Inventors: 이인구; 장-룩 제주인
Original assignee: 유한회사 나그라미디어코리아
Priority date: 2014-09-29
Filing date: 2014-09-29
Publication date: 2016-04-07

Abstract

The present invention relates to a gateway-based pay-TV management method based on utilization of UHD (Ultra-High-Definition) TV functions. The present invention relates to a method and apparatus for managing a scrambled media stream transmitted via a satellite, Through a satellite antenna, and transmitting to a gateway installed in each home; Selecting one of the plurality of received channels by a tuner; Modulating a scrambled media stream and an encryption key corresponding to the selected one viewing channel through a modulator; Decrypting the encryption key using a hardware-based unique authentication code installed in a system-on-chip form in the gateway and subscriber information of a smart card inserted in the gateway; Re-encrypting the decrypted key with a DRM key by a specific software installed in the gateway, and converting the decrypted key into a DRM scheme including a scrambled media stream of the selected channel and the re-encrypted DRM key; Transmitting the scrambled media stream and the DRM key to a smart TV through communication means such as Ethernet; Decrypting the received DRM key by an application installed in the smart TV based on the subscriber information; Descrambling the scrambled media data of the corresponding channel using the decrypted DRM key; And rendering a stream of the descrambled media data on a screen of the smart TV.

Description

(PayTV management method using UHD TV feature and Gateway thereof) based on UHD (Ultra-High-Definition)

The present invention relates to a gateway-based pay-TV management method based on UHD (Ultra-High-Definition) TV function utilization, and more particularly, to a conditional access system (CAS) And to prevent unauthorized viewing of the pay-TV broadcast.

Unlike free broadcast channels, which can be watched freely by anyone, pay channels define a standard called 'CAS' internationally for the method of paying a value to a channel that should pay a fair value for the provided satellite broadcast contents. The CAS is a method or system for granting or restricting the authority to view a broadcast program.

That is, when the broadcasting company transmits the encrypted media according to the CAS technology previously selected, the viewer can pay the broadcasting company for the fee-based broadcasting and purchase the smart card to view the broadcasting.

The conventional CAS for restricting the subscriber's viewing of pay broadcasts will now be described with reference to FIGS. 1 and 2. FIG.

First, a scrambled media stream and an encryption key for each of a plurality of channels transmitted from a satellite by a broadcasting satellite are received through a satellite antenna. The tuner in the set top box functions to select one of the plurality of received channels based on the channel selection of the user. The scrambled media stream and encryption key corresponding to the selected one channel are modulated in digital form by a modulator. The modulated encryption key is decrypted by the decryption module. In this case, the modulated encryption key is decrypted using unique information recorded in the system-on-chip form in the set-top box and subscriber information recorded in the subscriber card inserted in the set-top box. Descrambles the received scrambled media stream using the decrypted key, decompresses the descrambled media stream by the decoding module, and finally transmits the descrambled / decompressed media stream to the TV For example, an HDMI, a composite, a component port, or the like, and is rendered / displayed through a TV. In this case, the set-top box is entirely responsible for decrypting the encryption key contained in the received satellite signal and descrambling the scrambled media stream using such a decrypted key, It only serves to render / display the stream.

In recent years, smart TVs, in which the TV itself has a high performance and the TV itself acts as a computer, are becoming popular, and it is common that such a smart TV is equipped with a high-performance CPU. However, according to the above-described conventional method, the set-top box actually handles all data processing at the time of watching satellite broadcasting, and thus there is a limitation in utilizing a high-performance CPU incorporated in the smart TV. In general, these limitations have forced the set-top box to be still expensive enough to handle satellite signals, so the price of the set-top box was still expensive.

Therefore, the present inventor has minimized the functions of the set-top box and can sufficiently perform its functions even with a low-cost chip, while utilizing a function of descrambling the scrambled media in a high-performance CPU mounted on the smart TV And the key decrypted from the set top box is re-encrypted and transmitted to the smart TV, and the application installed in the smart TV is configured to re-decrypt the re-encrypted key based on the subscriber information, The present invention has been made to develop the present invention which enhances security to prevent unauthorized viewing by unauthorized third parties.

Korean Patent Publication No. 10-2004-0076739 Korean Patent Laid-Open Publication No. 10-2011-0000881

The present invention recognizes the limitations and problems of a method in which a set-top box decrypts an encryption key and descrambles a media stream entirely, and utilizes a high-performance CPU mounted in a smart TV instead of a CPU in a set- The DRM key is generated by re-encrypting the primary decrypted key in the set-top box, and then the DRM key is decrypted in the smart TV again to install the scrambled media stream in the smart TV itself Which is capable of enhancing security by allowing the CPU to descramble.

A gateway-based pay-TV management method based on utilization of UHD (Ultra-High-Definition) TV function according to the present invention is a method of managing a scrambled media stream of a plurality of channels transmitted via a satellite and an encryption key for each channel through a satellite antenna Receiving and transmitting to a gateway installed in each home; Selecting one of the plurality of received channels by a tuner; Modulating a scrambled media stream and an encryption key corresponding to the selected one viewing channel through a modulator; Decrypting the encryption key using a hardware-based unique authentication code installed in a system-on-chip form in the gateway and subscriber information of a smart card inserted in the gateway; Re-encrypting the decrypted key with a DRM key by a specific software installed in the gateway, and converting the decrypted key into a DRM scheme including a scrambled media stream of the selected channel and the re-encrypted DRM key; Transmitting the scrambled media stream and the DRM key to a smart TV through communication means such as Ethernet; Decrypting the received DRM key by an application installed in the smart TV based on the subscriber information; Descrambling the scrambled media data of the corresponding channel using the decrypted DRM key; And rendering a stream of the descrambled media data on a screen of the smart TV.

Preferably, the step of descrambling is descrambled by a CPU installed in the smart TV itself.

More preferably, the smart TV further comprises decompressing the descrambled media stream prior to rendering.

Most preferably, the application installed in the smart TV includes a software-based key protection algorithm driven in the application, and the smart TV includes a descrambling module and a decoating module mounted in a system-on-chip form, Module to descramble the scrambled media data of the selected channel and to decompress the descrambled media data by the decoding module.

More preferably, re-encrypting the DRM key and re-encrypting the re-encrypted DRM key includes re-encrypting the decrypted key with a DRM key using a DRM-based key encryption algorithm And inserting the re-encrypted DRM key into the scrambled media stream.

The present invention enables descrambling of a media stream using a high performance CPU mounted in a smart TV instead of a CPU in a set top box. When a key decrypted by a set-top box is re-encrypted and transmitted to a smart TV, Encrypted DRM key is decrypted by an application installed in a smart TV by a subscriber, thereby enhancing security.

1 is a conceptual diagram showing an example of a conventional satellite broadcast CAS system.
Fig. 2 is a block diagram showing a series of processes performed in the set-top box of Fig. 1; Fig.
3 is a conceptual diagram showing an example of a CAS system according to an embodiment of the present invention.
4 is a block diagram illustrating a specific function of the CAS system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gateway-based pay-TV management method based on UHD (Ultra-High-Definition) TV function utilization. The method includes receiving a plurality of channels of scrambled media data and an encryption key for each channel transmitted via a satellite via a satellite antenna and transmitting the encrypted data to a gateway installed in each home; Selecting one of the plurality of received channels by a tuner; Demodulating scrambled media data and an encryption key corresponding to the selected one of the viewing channels through a demodulator; Decrypting the encryption key using a hardware-based unique authentication code installed in a system-on-chip form in the gateway and subscriber information of a smart card inserted in the gateway; Re-encrypting the decrypted key by the specific software installed in the gateway, and converting the decrypted key into DRM including the scrambled media data of the selected channel and the re-encrypted DRM key; Transmitting the DRM to a smart TV through communication means such as Ethernet; Decrypting the received DRM key by an application installed in the smart TV; Descrambling the scrambled media data of the corresponding channel using the decrypted DRM key and rendering the stream of the descrambled media data on the screen of the smart TV.

First, a plurality of channels transmitted by a broadcasting company via a satellite are generally configured to include scrambled media data and an encryption key for each channel. The satellite signal thus transmitted is received through a satellite antenna installed in each home, and the received satellite signal is transmitted to the gateway.

The viewing channel of one of the received multiple channels is selected by the tuner built in the gateway by the selection of the subscriber. The scrambled media stream and encryption key corresponding to the selected one viewing channel are then digitally modulated by the modulator.

Next, the encryption key is decrypted using hardware-based unique authentication codes installed in a system-on-chip form in the gateway and subscriber information of a smart card inserted in the gateway.

That is, a subscriber who has requested to receive a satellite channel is provided with a gateway (separately provided as a conventional set-top box) and a smart card. A unique authentication code recorded in a system- Information on the subscriber and information on the right to view the receivable channel requested by the subscriber are stored.

Therefore, the CPU incorporated in the gateway attempts to decrypt the encryption key for the selected channel based on its own authentication code and information recorded in the smart card. If the decoding is completed, the subscriber is interpreted as having a viewing right for the selected channel, whereas if the decoding is not properly performed, it is interpreted as having no viewing right for the selected channel.

In this manner, the encryption key is decrypted based on the unique authentication code recorded in the system-on-chip form in the gateway and the smart card information, thereby fundamentally solving the risk of unauthorized hacking by a third party. That is, since the accessibility to the unique authentication code recorded in the system-on-chip form is strictly restricted, even if the information of the smart card is hacked by a hacker or the like, such information alone can not decrypt the encryption key of the corresponding channel.

Then, the decrypted key is re-encrypted by the specific software installed in the gateway. Through this re-encryption process, the DRM method including the scrambled media stream of the selected channel and the re-encrypted DRM key is converted do. That is, the decrypted key is re-encrypted with a DRM key using a DRM-based key encryption algorithm, and the re-encrypted DRM key is inserted into the scrambled media stream. Thus, according to the conventional method, the operation of descrambling the scrambled media stream in the set-top box using the decrypted key is directly performed. However, in the present invention, the decrypted key is decrypted through the DRM method Lt; / RTI > As a result, it is possible to prevent the occurrence of unauthorized hacking by a third party in the process of being transmitted from the gateway to the smart TV.

Thus, the re-encrypted DRM key and media stream for the selected channel are transmitted to the smart TV through communication means such as Ethernet.

Then, the received DRM key is decrypted by an application installed in the smart TV. In this case, the application installed in the smart TV includes a software-based key protection algorithm driven in the application, and decrypts the re-encrypted DRM key based on the information of the subscriber updated or stored in the application installation step. For example, the specific application may comprise a DRM-based media player.

Next, the smart TV includes a descrambling module and a decoating module mounted in a system-on-chip form, the descrambling module descrambles the scrambled media data of the corresponding channel using the decrypted DRM key, The decoding module decompresses the descrambled media data.

Then, the stream of the descrambled media data is finally rendered / displayed on the screen of the smart TV.

Although the present invention has been described in detail with reference to specific embodiments thereof with reference to the accompanying drawings, the present invention is not limited to such specific structures. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the following claims. However, it is intended that the present invention covers all such modifications and variations as fall within the true scope of the invention.

Claims

A gateway-based pay-TV management method based on UHD (Ultra-High-Definition) TV function utilization,
Receiving a scrambled media stream of a plurality of channels transmitted via a satellite and an encryption key for each channel through a satellite antenna and transmitting the encrypted stream to a gateway installed in each home;
Selecting one of the plurality of received channels by a tuner;
Modulating a scrambled media stream and an encryption key corresponding to the selected one viewing channel through a modulator;
Decrypting the encryption key using a hardware-based unique authentication code installed in a system-on-chip form in the gateway and subscriber information of a smart card inserted in the gateway;
Re-encrypting the decrypted key with a DRM key by a specific software installed in the gateway, and converting the decrypted key into a DRM scheme including a scrambled media stream of the selected channel and the re-encrypted DRM key;
Transmitting the scrambled media stream and the DRM key to a smart TV through communication means such as Ethernet;
Decrypting the received DRM key by an application installed in the smart TV based on the subscriber information;
Descrambling the scrambled media data of the corresponding channel using the decrypted DRM key; And
Rendering a stream of the descrambled media data on a screen of the smart TV;
&Lt; / RTI >

The method as claimed in claim 1, wherein the step of descrambling is descrambled by a CPU installed in the smart TV itself.

2. The method of claim 1, wherein the smart TV further comprises decompressing the descrambled media stream prior to rendering.

The smart TV as claimed in claim 3, wherein the application installed in the smart TV includes a software-based key protection algorithm driven in the application, the smart TV includes a descrambling module and a decoating module mounted in a system- Descrambling the scrambled media data of the selected channel by the scrambling module, and decompressing the descrambled media data by the decoding module.

The method of claim 1, wherein re-encrypting with the DRM key and converting into a DRM scheme including a re-encrypted DRM key comprises:
Re-encrypting the decrypted key with a DRM key using a DRM-based key encryption algorithm; and
Inserting the re-encrypted DRM key into the scrambled media stream;
&Lt; / RTI >