• The KIPS Transactions:PartC
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• v.18C no.4
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• pp.227-236
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• 2011

IPTV(Internet Protocol Television) is one of the typical businesses which are the convergence of Broadcast and Communication. It provides broadcasting service using IP networks. Recently, IPTV service is developed to Mobile IPTV or Open IPTV. Especially, Open IPTV uses open platform so not only service providers but also general users can provide contents to other users. Open IPTV system has many content providers, so existing security solution of IPTV cannot be adopted. In this paper, we suggest user authentication and key distribution mechanism on Open IPTV. Our proposed mechanism is based on Kerberos, so it can support distribution environment such as Open IPTV. We demonstrate that proposed mechanism can guarantee secure transmission of contents and reduce the delay of user authentication on Open IPTV system compared to other authentication mechanisms. We also compare our proposal and other mechanisms in various aspects, and analyze efficiency and safety of proposed mechanism. As a result, we insist that this mechanism satisfies the security requirements for IPTV.

• The Journal of the Korea Contents Association
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• v.10 no.7
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• pp.55-62
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• 2010

While the broadband network and multimedia technologies have been developing, the commercial market of digital contents also has been widely spreading with recently starting IPTV. As the IPTV services are getting to be generalized and popularized, the contents illicit copying and distribution of copyright meterials tends to draw more attentions. So we need a right service system that can protect contents and copyright using watermark inserting. Until now, the conventional protection and authentication system is taking advantages of merits both in CAS and DRM. But this system can not protect the contents when acquiring them from TV output using A/D convertor. So we apply watermark method using HSI color space against contents illicit copying. And for distribution of copyright materials. we compound unique settop ID and copyrighter's ID to make new ID that is watermark. When inserting watermark, we use the watermark for copyright protection and authentication. So we can protect copyright and identify last settop's user in illicit distribution. we design download based IPTV contents protection and authentication system using HSI watermark method.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.3 no.2
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• pp.163-177
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• 2009

The demand for services using digital technology is constantly increasing as new developments in digital consumer electronics and the Internet are made. This is especially true in terms of the demand for IPTV utilizing high speed Internet networks. Research on IPTV threats is important for facilitating financial transactions via IPTV and preventing illegal use or copying of digital content. Thus, this paper analyzes IPTV threats via the IPTV value chain. That is, the distribution system for IPTV service is analyzed along with the components of the value chain and corresponding IPTV security requirements or security technologies, in order to perform a threat analysis and research suitable for the IPTV service environment. This paper has a greater focus on the value chain of the IPTV business than the approach in previous research, in order to analyze security requirements and technologies that are more applicable to the business environment.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1260-1262
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• 2010

IPTV 는 대표적인 방송통신융합 산업으로 IT 망의 양방향성을 이용한 서비스의 차별화를 내세우며 여러 사업자에 의해 서비스가 이루어지고 있다. 기존 유선 통신망을 중심으로 제공되어 왔던 IPTV 서비스는 최근 모바일 환경 등으로 그 영역을 확대하기 위해 연구가 진행되고 있으며, 다른 한편으로는 IPTV 서비스를 위한 플랫폼 등을 개방하여 사업자가 아닌 일반인도 IPTV 를 통한 방송을 할 수 있는 구조인 Open IPTV 에 대한 연구가 활발하다. 이러한 Open IPTV 환경에서는 다수의 컨텐츠 제공자가 존재하기 때문에 기존 IPTV 에서 사용 되는 특정 기기 혹은 스마트카드를 통한 사용자 인증 및 키 분배가 어려운 실정이다. 따라서 본 논문에서는 Open IPTV 환경에서 안전한 컨텐츠 전송을 위한 사용자 인증 및 키 분배 시스템을 제안하고자 한다.

• Journal of Information Technology Applications and Management
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• v.22 no.2
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• pp.43-70
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• 2015

Concerns have been growing about whether domestic internet protocol television (IPTV) can establish a solid foothold in the pay TV market, largely because of the lack of IPTV-only content and service differentiation. It has been difficult for IPTV providers to attract valuable PPs (program providers) to strengthen their positions, and IPTV providers have invested much money into procuring content. To survive this difficult situation, IPTV providers need to reappraise their profit sharing methods and content distribution structure to facilitate the expansion of their subscriber base. This can be done by attracting valuable PPs to IPTV providers and securing extra revenue by distributing more content for their PP partners. The IPTV industry has a different structure and value chain from the digital cable industry. Moreover, profit sharing schemes among participants in the IPTV industry are complicated. Thus it is essential to analyze the criteria for profit sharing, the selection of attributes in profit sharing, and their cause-effect relationship in developing fair pricing for broadcast content in the IPTV industry. This study introduces the attributes that need to be considered for the pricing of content and profit sharing among IPTV providers and PPs. In addition, this study uses system dynamics to analyze the relationship among those attributes along with additional associated factors for the pricing of content.

• Journal of Communications and Networks
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• v.17 no.3
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• pp.296-305
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• 2015

Coupled schemes between service-oriented architecture (SOA) and Web 2.0 have recently been researched. Web-based content providers and telecommunications company (Telecom) based Internet protocol television (IPTV) providers have struggled against each other to accommodate more three-screen service subscribers. Since the advent of Web 2.0, more abundant reproduced content can be circulated. However, because according to increasing device's resolution and content formats IPTV providers transcode content in advance, network bandwidth, storage and operation costs for content management systems (CMSs) are wasted. In this paper, we present a user centric CMS for open IPTV, which integrates SOA and Web 2.0. Considering content popularity based on a Zipf-like distribution to solve these problems, we analyze the performance between the user centric CMS and the conventional Web syndication system for normalized costs. Based on the user centric CMS, we implement a social Web TV with device-aware function, which can aggregate, transcode, and deploy content over social networking service independently.

• Journal of the Korea Society of Computer and Information
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• v.15 no.7
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• pp.57-66
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• 2010

Due to the advancement of IPTV technologies, open IPTV services are a step closer to becoming reality. In such service environment, users are able to enjoy IPTV services using a variety of devices available at their home domain. However, it is impossible to get such flexible services at their convenience unless each of devices is individually connected to Set-Top-Box (STB) because of Conditional Access System (CAS) or service providers otherwise allow STB to freely distribute decoded contents to every user devices attached to STB. In this paper, we propose a key management scheme for securely distributing contents from STB to multiple user devices at home domain. The proposed scheme also makes the service providers be able to control the access rights to each of user devices without installing individual STBs. It is achieved by computationally dividing a private key of RSA signature scheme into three parts and thus makes possible to distribute the contents scrambled through a underlying CAS mechanism without re-encrypting them that the existing scheme should employ. It improves significantly computation and communication complexities, maintaining it as secure as the existing schemes. Additionally, it prevents misbehaving users from illegally distributing the contents from STB to their devices available at home domain.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.845-850
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• 2011

In this paper, we proposed the digital contents distribution business model for the operation of integration between heterogeneous systems in order to use IPTV. Also, we designed and implemented the protection management system through this distribution business model. This proposed model maintains interoperability between the heterogeneous systems, creates rights protection document based on REL, and provides the new version of packaged digital contents to itself by packaging the digital contents. Overall, it ultimately offers an interoperable environment. Moreover, since we pre-defines the relations among REL data based on MPEG-21 standard, which creates the newly packaged digital contents, it is easy to edit data. We can expect to save expenses of digital contents distribution and rights protection technology. Additionally, we can further improve security by encapsulating the security technology of CAS and DRM system.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1489-1492
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• 2009

현대 사회는 IT 기술의 발전과 인터넷 및 디바이스의 발전으로 인해 다양한 기술이 융합된 컨버전스 현상이 급진전되고 있으며, 방송과 통신의 융합 흐름은 더욱 가속화될 전망을 보이고 있으며, 특히 현재 제공되고 있는 IPTV(Internet Protocol Television) 서비스를 통해 빠른 성장세를 보이고 있다. 그러나 이와 같은 IPTV는 기존 IP 네트워크 기반으로 서비스를 제공하고 있으며, 이는 이전의 사이버공격 기술이 그대로 적용될 수 있는 문제점을 내포하고 있다. 따라서 본 연구에서는 IPTV 실시간 방송 서비스 환경에서 AAA 서버를 이용한 멀티캐스트 키 관리 기술을 제안하였다. 멀티캐스트 키 구조는 계층적 트리 방식을 적용하였으며, ID 기반 멀티캐스트 키 관리 기술을 제안하여 안전하고 효율적인 서비스를 제공할 수 있도록 하였다.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.142-150
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• 2015

This study examines the effect of changes in the content distribution strategy on VOD usage by comparing the VOD usage pattern following the changes in the IPTV and Digital Cable SVOD holdback policy. The result of this study shows that after changing the SVOD holdback from one week to three weeks, the VOD usage decreased up to 50 percent while paid VOD revenue increased as a result of the rise in PPM. The time series analysis shows statistical decrease in the number of SVOD usage, SVOD usage per user, and PPV revenue per user while VOD revenue per user increased significantly. Moreover, SVOD usage within the drama genres such as mini-series, weekend series, weekend special series, and sitcom decreased significantly. This research provides a case study on the effect of the broadcaster's content distribution policy on the VOD user behavior thus proposing broadcasters and platform operators the ways of establishing distribution strategy as well as invigorating the VOD usage.