WO2005013127A1 - Copy-protected application for digital broadcasting system - Google Patents
Copy-protected application for digital broadcasting system Download PDFInfo
- Publication number
- WO2005013127A1 WO2005013127A1 PCT/IB2004/002573 IB2004002573W WO2005013127A1 WO 2005013127 A1 WO2005013127 A1 WO 2005013127A1 IB 2004002573 W IB2004002573 W IB 2004002573W WO 2005013127 A1 WO2005013127 A1 WO 2005013127A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- application
- terminal
- server
- launcher
- main
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/633—Control signals issued by server directed to the network components or client
- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
- H04N21/2351—Processing of additional data, e.g. scrambling of additional data or processing content descriptors involving encryption of additional data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
- H04N21/4353—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream involving decryption of additional data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
- H04N21/4433—Implementing client middleware, e.g. Multimedia Home Platform [MHP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/633—Control signals issued by server directed to the network components or client
- H04N21/6332—Control signals issued by server directed to the network components or client directed to client
- H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
- H04N21/63345—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key by transmitting keys
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
Definitions
- This invention relates to digital broadcasting systems and, in particular, to the delivery of applications to terminals in such systems.
- Digital Video Broadcasting (DVB) systems were originally developed to deliver audio and video material. In recent years there has been increasing interest in delivering applications which can be downloaded and executed by terminals.
- the Digital Video Broadcasting Multimedia Home Platform (DVB- MHP) is a result of efforts to harmonise standards for multimedia set top boxes. It is an open, published, standard for interactive digital television. DVB-MHP, or simply MHP, defines a generic interface between interactive digital applications and the terminals which execute those applications.
- MHP standards such as ETSI TS 101 812 V1.3.1 , can be viewed at www.etsi.org. Version 1.0.3 of the MHP standard supports freely downloadable applications called 'Xlets'.
- Digital Video Broadcasting Globally Executable MHP (DVB- GEM), set out in ETSI TS 102 819, also supports downloadable applications.
- Some broadcasters choose to encrypt an entire broadcast stream using a conditional access (CA) system so as to restrict access to content, such as broadcast channels or applications, only to those who have subscribed to their sen/ices. While this has proved to offer a high degree of protection to piracy of the content, it requires dedicated descrambling hardware at the user's set-top box. Viewers need either a special set-top box that includes the CA system, or a set-top box with a slot which conforms to the DVB Common Interface (DVB- Cl) and a CI module containing the CA system.
- CA conditional access
- MHP is based around a JavaTM virtual machine, with applications written in Java and then compiled into Java bytecode. It would be desirable to encrypt the JavaTM class files that are transmitted in the broadcast stream.
- a first aspect of the present invention provides a method of downloading an application at a terminal in a digital broadcasting system, comprising the steps of: receiving a launcher application; starting the launcher application; creating a server on the terminal; and generating an application loader for loading a main application into the terminal via the server.
- the main application is an encrypted application and the launcher application is arranged to decrypt the main application as it is loaded via the server.
- the creation of a server on the terminal allows the decrypted application to be safely stored within the terminal, minimising exposure to hackers.
- the newly created server on the terminal is provided with a port and the address of the port is supplied to the application loader.
- the address will be localhost or 127.0.0.1 Where the terminal is an MHP terminal, this allows an application loader of the type 'DVBClassLoader' to be used, which expects to load classes from a uniform resource locator (URL).
- the server is allocated a URL and the URL is supplied to the DVBClassLoader function.
- the launcher application and main application can be received together (i.e. sequentially, one directly after the other), or at separate times.
- the launcher application and main application can be sent via the same delivery channel or via separate delivery channels.
- the launcher application and main application can both be received via a broadcast channel; while in another example the launcher application is received via a broadcast channel while the main application is received via an internet delivery channel.
- the server is arranged to only respond to connection requests which originate inside the terminal to ensure the application remains secure.
- the method further comprises contacting an external party to obtain authorization before decrypting the main application. It is preferred that a decryption key is received from the external party in response to the user being authorized. However, in a simpler variation, the decryption key can be supplied with the launcher application.
- the terminal is most likely to take the form of a set-top box (STB) but it can take other forms, such as a multimedia personal computer (PC) or a television set which incorporates the functionality of the set-top box.
- the invention is particularly applicable to all current versions of the Multimedia Home Platform (MHP), although it has wider application to digital broadcasting systems.
- MHP Multimedia Home Platform
- DVB-GEM Globally Executable MHP - this is a subset of MHP which is not dependent on DVB-SI;
- OCAP OpenCable Application Platform, the new US cable standard based on GEM;
- ATSC-DASE Advanced Television Systems Committee (ATSC) Digital TV Applications Software Environment (DASE), the US terrestrial standard, currently being rewritten based on GEM;
- ARIB-AE ARIB (a Japanese TV standards body) standard B-23 "Application Execution Engine Platform for Digital Broadcasting" (ARIB- AE), based on GEM.
- FIG. 1 shows a digital video broadcast (DVB) system embodying the invention
- Figure 2 shows the functional blocks within a subscriber terminal for use in the system of Figure 1
- Figure 3 shows the components of an encrypted application in accordance with the invention
- Figure 4 shows a flow chart for processing an encrypted application.
- Figure 1 shows an overall digital video broadcasting system for delivering applications to a terminal. Content is generated by a broadcaster 30 and converted into a suitable format for transmission, via a broadcast channel 35, to user premises 100. One such premises 100 is shown.
- the broadcast channel 35 is delivered via a satellite although it can be delivered by a terrestrial transmission network, by a cable distribution network, or by a data network such as the Internet, and the method of delivery is not important to the invention.
- a terminal (STB) 60 at a user premises receives the broadcast stream, which in this example is via an antenna 18.
- the broadcast stream delivered via the broadcast channel 35 comprises audio and video content as well as data for supporting various services and applications.
- data for applications is broadcast as part of a Digital Storage Media - Command and Control (DSM-CC) Object Carousel. This is a repetitively broadcast file system containing the data files for various applications.
- DSM-CC Digital Storage Media - Command and Control
- the format of the broadcast channel for the DVB-MHP system, including the DSM-CC, is set out in ISO/IEC 13818-6, to which the skilled reader is directed for further information.
- Applications can be created by the broadcaster 30 or by independent application providers 50 who supply the required files to the broadcaster 30 for insertion in the DSM-CC. Examples of applications include electronic programme guides (EPG), games, quizzes, instructional guides and e- commerce applications such as home banking.
- EPG electronic programme guides
- games games
- quizzes e- commerce applications
- e- commerce applications such as home banking.
- the set top box 60 is also provided with a modem to support a return (or interaction) channel 85 to allow the set top box 60 to send data to, and receive data from, external parties.
- the interaction channel typically uses a conventional telephony network such as POTS.
- the interaction channel 85 can take the form of: a dial-up (POTS) connection directly to an application provider 50, a connection to a gateway of a data network such as the internet, with the connection between the gateway and the application provider 50 being carried across the data network, a combination of a cable back-channel and a connection across a data network (internet) to the application provider, an ADSL or other broadband internet connection, satellite uplink or ISDN line.
- Set-top box 60 also includes a user interface with a remote control 20 or keyboard for receiving user inputs and a graphical output which can be overlaid upon the video signal 10 which is fed to television display 12.
- An MHP terminal is built around a JavaTM Virtual Machine (JVM) and applications are written in Java.
- JVM JavaTM Virtual Machine
- FIG. 1 shows the functional blocks within a typical MHP terminal 60.
- terminal 60 includes a front end for processing a received broadcast. signal 35. This includes a tuner 61 and demodulator for selecting and demodulating a required channel and an optional conditional access unit 62 for descrambling the signal.
- the resulting digital data stream is demultiplexed 63 into data streams representing audio and video data (typically in MPEG-2 format) and data for applications in the form of the repetitively broadcast DSM-CC Object Carousel 64.
- the audio and video data can then be further processed 65 to derive suitable output signals 12, 14 for presentation to a user.
- the application Once downloaded from the broadcast stream, the application (or several applications) will reside on memory 69 in the terminal and will be executed by microprocessor 68 in the terminal.
- An application may receive user inputs 22, generate audio and video outputs, and access the interaction channel 85.
- Control software for operating the microprocessor 68 also resides on a memory device.
- Figure 2 shows a terminal which is intended to receive signals via a broadcast delivery channel.
- the tuner/demodulator 61 is replaced by a network interface appropriate to the delivery channel. This can be an Internet Protocol (IP)-based delivery channel.
- Figures 3 and 4 show the process for downloading an encrypted application from the broadcast stream.
- Figure 3 shows the components of the transmitted application while Figure 4 shows a flow chart of the process performed by a terminal 60 to download and run an application.
- a user requests that an application "X" is downloaded.
- the request can be made in a conventional manner, such as by a user navigating through on- screen menus and pressing keys on remote control 20.
- the requested application is broadcast in two parts, shown collectively as block 300: - a 'launcher' or 'loader' Xlet 310 which is broadcast in an unencrypted format; - the main application 320, which is broadcast in an encrypted format.
- the main application 320 includes classes 321 and data 322, both of which are encrypted.
- the encrypted main application can be transmitted via the DSM-CC Data Carousel, DSM-CC MPE (IP Multicast encapsulation), via Data Piping or even via the Internet.
- the launcher application 310 and encrypted main application 320 can be transmitted together, or separately.
- the terminal retrieves the necessary files for application X from the object carousel 64 in the broadcast stream.
- the launcher application 310 is then started.
- the launcher application 310 contacts the application provider 50 over the interaction channel 85, sending an authorization request 314.
- the purpose of contacting the application provider 50 is to ensure that the user is authorized to run the application. This step may also involve collecting payment from the user before authorizing them to use the application.
- the launcher application 310 prompts the user for credit card details. Upon receiving the credit card details 317, the launcher application 310 contacts the payment authorization entity 55 at application provider 50 and passes the credit card details.
- a decryption key 313 is returned from the application provider 50 to the terminal 60 over the interaction channel 85; the launcher application 310 dials a premium-rate telephone number operated by the application provider 50. The call is maintained until the cost of the phone call incurred by the user of the terminal 60 equals the price of the application. At this point the application provider 50 sends a decryption key 313 to the launcher application 310 and the call is terminated; the launcher application 310 prompts the user for a subscription or club membership number, possibly with a password or PIN. The launcher application then contacts 314 the application provider 50 and provides this information.
- a decryption key 313 is sent from the application provider 50 to the terminal 60; the launcher application 310 takes payment from a smartcard (e.g. German Geldmaschine) which is inserted into a card reader on terminal 60 and then contacts the application provider 50 to obtain a decryption key. It will be appreciated that any other means can be used where the launcher application 310 contacts the application provider 50 to obtain a decryption key 313, preferably after paying the application provider 50 in some way. Referring again to Figure 4, at step 408 the launcher application 310 now needs to decrypt and run the MHP application 320. In order to overcome the restriction on creating a ClassLoader, the launcher application 310 includes code to create a small HTTP server 315 on the terminal 60.
- a smartcard e.g. German Geldmaschinen
- the launcher application 310 includes code to create a small HTTP server 315 on the terminal 60.
- the launcher application 310 starts this HTTP server 315.
- the HTTP server 315 will create a java.net.Se ⁇ /erSocket class with a specified port.
- the launcher application 310 then creates a DVBClassLoader 316.
- DVBClassLoader is a part of the MHP standard and can only load classes from a URL, e.g. from a HTTP server.
- the launcher application 310 passes the URL of the HTTP server 315 that it has just created to the DVBClassLoader 316.
- Socket Java. net. Socket
- the launcher application 310 can then start the main application 330 inside the DVBClassLoader 316.
- Decrypting the main application 320, and any data it needs, can be done with any standard decryption algorithm. Examples of these include Data Encryption Standard (DES), Triple Data Encryption Standard (3DES) and Advanced Encryption Standard (AES).
- DES Data Encryption Standard
- 3DES Triple Data Encryption Standard
- AES Advanced Encryption Standard
- the decryption algorithm may need to be broadcast with the application.
- the preferred manner of decryption is decryption on-demand, i.e. when an application needs to load a class, a request is sent from the DVBClassLoader to the HTTP server for the data for that class.
- the encrypted class files are downloaded from the DSM-CC, decrypted and then passed to the HTTP server 315 from where they are extracted.
- the HTTP server 315 rejects any connections that do not originate from within the MHP terminal. Ideally, the HTTP server 315 should be listening only on the 'localhost 1 IP address, so normal TCP/IP semantics will block external connections. This means that the decrypted classes do not leave the MHP terminal 60.
- Devices supporting TCP/IP may have multiple network interfaces. Typically each network interface corresponds to a single physical network connection. However, all TCP/IP devices have a special virtual network interface, called the 'loopback' interface.
- Data used by the application 320 is decrypted using the same key 313, but does not need to be sent through the HTTP server 315. Instead, the decrypted data passes directly to the main application 330. In the above description, the encrypted data 322 used by the main application is decrypted and then passed directly to the main application 330. As an alternative, the data could be passed to the HTTP server 315.
- the server 315 need not be a HTTP server, but could be a server for any protocol supported by the MHP terminal, including FTP.
- the authorization entity 55 is shown as being part of the application provider 50. This need not be the case. Authorization entity 55 can be physically separate from the application provider and perform the authorization function on behalf of the application provider 50.
- the decryption key 313 is supplied by the application provider 50 in response to payment by the user, or suitable authorization. However, this technique may be used merely to make an application harder to reverse engineer. In this case, the decryption key 313 can be supplied as part of the launcher application 310. Classes would still be decrypted into a HTTP server 315 and would remain inside the terminal 60. The invention is not limited to the embodiments described herein, which may be modified or varied without departing from the scope of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Software Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/566,761 US20060253897A1 (en) | 2003-08-02 | 2004-07-28 | Copy-protected application for digital broadcasting system |
EP04744212A EP1654639A1 (en) | 2003-08-02 | 2004-07-28 | Copy-protected application for digital broadcasting system |
JP2006522438A JP2007501461A (en) | 2003-08-02 | 2004-07-28 | Copy protection application for digital broadcasting system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0318198.9 | 2003-08-02 | ||
GBGB0318198.9A GB0318198D0 (en) | 2003-08-02 | 2003-08-02 | Copy-protected application for digital broadcasting system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005013127A1 true WO2005013127A1 (en) | 2005-02-10 |
Family
ID=27799741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2004/002573 WO2005013127A1 (en) | 2003-08-02 | 2004-07-28 | Copy-protected application for digital broadcasting system |
Country Status (7)
Country | Link |
---|---|
US (1) | US20060253897A1 (en) |
EP (1) | EP1654639A1 (en) |
JP (1) | JP2007501461A (en) |
KR (1) | KR20060070533A (en) |
CN (1) | CN1833223A (en) |
GB (1) | GB0318198D0 (en) |
WO (1) | WO2005013127A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2335466A1 (en) * | 2008-09-12 | 2010-03-26 | Global Touch Express, S.L | Device and procedure for the charge and execution of applications in a digital television decoder mhp (Machine-translation by Google Translate, not legally binding) |
WO2011056800A1 (en) * | 2009-11-03 | 2011-05-12 | Qualcomm Incorporated | Control link for wireless display unit |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070150892A1 (en) * | 2005-12-22 | 2007-06-28 | Samsung Electronics Co., Ltd. | Scheduled delivery of software download |
KR100777409B1 (en) * | 2006-06-05 | 2007-11-19 | 주식회사 알티캐스트 | Method for provisioning network service provider application in digital interactive broadcasting |
US20080175569A1 (en) * | 2007-01-23 | 2008-07-24 | Mark Rogers Johnson | Extension of Media Player Environments |
EP2026558A1 (en) * | 2007-07-30 | 2009-02-18 | Sony United Kingdom Limited | Transport stream module for digital television receiver |
CN101576989A (en) * | 2009-06-09 | 2009-11-11 | 阿里巴巴集团控股有限公司 | Method for realizing payment in mobile terminal and mobile device |
TWI567664B (en) * | 2010-03-08 | 2017-01-21 | 阿里巴巴集團控股有限公司 | Payment method in mobile terminal and mobile device |
CN110493631A (en) * | 2018-05-15 | 2019-11-22 | 中国移动通信集团浙江有限公司 | A kind of set-top box Launcher adaptation method |
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US5987523A (en) * | 1997-06-04 | 1999-11-16 | International Business Machines Corporation | Applet redirection for controlled access to non-orginating hosts |
US6070239A (en) * | 1995-12-08 | 2000-05-30 | Sun Microsystems, Inc. | System and method for executing verifiable programs with facility for using non-verifiable programs from trusted sources |
US20020055910A1 (en) * | 1998-09-10 | 2002-05-09 | David John Durbin | Program component distribution |
EP1233333A1 (en) * | 2001-02-19 | 2002-08-21 | Hewlett-Packard Company | Process for executing a downloadable service receiving restrictive access rights to al least one profile file |
US20020138848A1 (en) * | 2001-02-02 | 2002-09-26 | Rachad Alao | Service gateway for interactive television |
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US6157719A (en) * | 1995-04-03 | 2000-12-05 | Scientific-Atlanta, Inc. | Conditional access system |
NZ506004A (en) * | 2000-07-27 | 2001-10-26 | Owlcentral Ltd | Online document assembler |
-
2003
- 2003-08-02 GB GBGB0318198.9A patent/GB0318198D0/en not_active Ceased
-
2004
- 2004-07-28 CN CNA2004800224261A patent/CN1833223A/en active Pending
- 2004-07-28 US US10/566,761 patent/US20060253897A1/en not_active Abandoned
- 2004-07-28 WO PCT/IB2004/002573 patent/WO2005013127A1/en not_active Application Discontinuation
- 2004-07-28 EP EP04744212A patent/EP1654639A1/en not_active Withdrawn
- 2004-07-28 KR KR1020067002320A patent/KR20060070533A/en not_active Application Discontinuation
- 2004-07-28 JP JP2006522438A patent/JP2007501461A/en not_active Withdrawn
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US6070239A (en) * | 1995-12-08 | 2000-05-30 | Sun Microsystems, Inc. | System and method for executing verifiable programs with facility for using non-verifiable programs from trusted sources |
US5987523A (en) * | 1997-06-04 | 1999-11-16 | International Business Machines Corporation | Applet redirection for controlled access to non-orginating hosts |
US20020055910A1 (en) * | 1998-09-10 | 2002-05-09 | David John Durbin | Program component distribution |
US20020138848A1 (en) * | 2001-02-02 | 2002-09-26 | Rachad Alao | Service gateway for interactive television |
EP1233333A1 (en) * | 2001-02-19 | 2002-08-21 | Hewlett-Packard Company | Process for executing a downloadable service receiving restrictive access rights to al least one profile file |
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ANGEL D ET AL: "HOW DO I STORE A JAVA APP IN A SELF-EXECUTING ENCRYPTED FILE?", DR. DOBB'S JOURNAL, M&T PUBL., REDWOOD CITY, CA,, US, vol. 24, no. 2, February 1999 (1999-02-01), pages 115 - 116,118,12, XP000900774, ISSN: 1044-789X * |
KNIESEL G ET AL: "JAC-ACCESS RIGHT BASED ENCAPSULATION FOR JAVA", SOFTWARE PRACTICE & EXPERIENCE, JOHN WILEY & SONS LTD. CHICHESTER, GB, vol. 31, no. 6, 1 May 2001 (2001-05-01), pages 555 - 576, XP001005078, ISSN: 0038-0644 * |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2335466A1 (en) * | 2008-09-12 | 2010-03-26 | Global Touch Express, S.L | Device and procedure for the charge and execution of applications in a digital television decoder mhp (Machine-translation by Google Translate, not legally binding) |
WO2011056800A1 (en) * | 2009-11-03 | 2011-05-12 | Qualcomm Incorporated | Control link for wireless display unit |
US8332904B2 (en) | 2009-11-03 | 2012-12-11 | Qualcomm Incorporated | Control link for wireless display unit |
Also Published As
Publication number | Publication date |
---|---|
GB0318198D0 (en) | 2003-09-03 |
CN1833223A (en) | 2006-09-13 |
JP2007501461A (en) | 2007-01-25 |
US20060253897A1 (en) | 2006-11-09 |
KR20060070533A (en) | 2006-06-23 |
EP1654639A1 (en) | 2006-05-10 |
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