Sony Ericsson is actively focusing on technology standardization for the DRM concept, and supports the ongoing standardization work and activities of the OMA (Open Mobile Alliance). Sony Ericsson is fully committed to open standard solutions in the mobile environment and is a principal driver of many open standard initiatives. This will ensure the interoperability of mobile terminals in the DRM area and also result in a strong, competitive DRM standard.

How DRM works

The control of the content in digital media is executed by defining usage rights for the content. The usage rights give the content providers flexibility in the way they can publish and sell content. Rights can be defined so that a picture can be used by subscribers only, and rights can be defined so that a ringtone can be played only a limited number of times or for a limited period of time. Rights can also be defined so that the user is not able to forward content to other devices.

Note: All supported image, audio and video formats can be protected by DRM.

Packaging of rights and content

Rights and content can be packaged together and delivered to the device as one DRM package. As an alternative, content can be delivered to the device first, followed by the rights later being pushed to the device, for example via SMS. The kind of service and business model adopted by the content provider determines how the content and rights should be packaged and delivered to the device.

DRM packager

A DRM packager is typically included in the software used by the content provider. It is used to create the DRM package that is delivered to the device, including content and associated rights. In the device, the content of the DRM package is made available to the user according to the rights. For example, if the rights permit the user to play a ringtone ten times, the device will keep track of the number of times the ringtone is played, and notify the user when the ringtone has been used for the tenth time.

White Paper K700

A Sony Ericsson DRM Packager is available from the Sony Ericsson Developer World at http:// www.sonyericsson.com/developer.

Protection properties

Content protection according to the OMA DRM standard gets special properties. Content with forward lock protection has the “Send to” option disabled, which prevents it from further distribution.

Unless the content is encrypted, the user cannot copy DRM content to other devices since the Send to option is disabled for pictures, ringtones, etc. that are OMA DRM protected. Content providers may choose to protect some content, but leave some content unprotected.

Package and delivery

The OMA DRM standard defines two ways to package and deliver rights and content to a device: combined or separated.

Combined delivery

Rights and content are packaged together into one DRM Package and delivered to the device. In the simplest case, no special rights are defined. The content is just put into a DRM package, thus protected from being copied out from the device by the user. This special case is called forward-lock. It is useful for all types of content that the provider wants to charge for.

Separate delivery

Rights are defined and sent in a push message. The content is encrypted and made available for users to download to their devices. The decryption key is put into the rights file. Since the content is encrypted, users cannot access it before the rights have also arrived in the device. In this case, the content can be freely distributed on the network, only users with the rights file can access the content. Content providers can deliver the rights to the user using push technology.

Downloading servers and publishing servers

When using a mobile phone, the users do not have to be aware of the network architecture. During a content downloading session, typically many

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Sony Ericsson K700 manual How DRM works, Packaging of rights and content, DRM packager, Protection properties
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K700 specifications

The Sony Ericsson K700, launched in 2004, quickly became a notable player in the mobile phone market due to its impressive features and appealing design. Positioned as a mid-range device, it combined functionality with a user-friendly interface, making it a popular choice for consumers seeking versatility in a mobile phone.

One of the standout features of the K700 was its 1.3-megapixel camera, which was quite advanced for its time. This allowed users to capture photos and videos, complete with a video recording function. The camera also came equipped with a built-in flash, enhancing its performance in low-light conditions. The convenience of multimedia messaging meant that users could easily share their captured moments with friends and family.

The K700 boasted a vibrant 1.9-inch TFT display capable of a resolution of 176 x 220 pixels. This screen provided a bright and clear interface for browsing menus, viewing photos, and playing games. The phone's design was sleek and compact, featuring a comfortable keypad for easy messaging and dialing. The overall aesthetic appeal was complemented by a variety of color options, catering to different consumer preferences.

In terms of connectivity, the Sony Ericsson K700 supported GPRS, allowing users to access the internet for basic browsing and email functionalities. It also supported Bluetooth technology, enabling wireless connections with other devices for file sharing and hands-free use. The inclusion of a proprietary memory card slot allowed users to expand storage for photos, music, and other files, providing flexibility in managing content.

The K700 also featured a solid battery life, allowing up to 12 hours of talk time and around 400 hours of standby time, making it reliable for daily use. With features like a built-in FM radio, Java-based games, and customizable wallpapers, it offered a comprehensive experience to users who valued multimedia capabilities.

In summary, the Sony Ericsson K700 was a well-rounded mobile phone that delivered a combination of camera functionality, connectivity options, and a user-friendly experience. It represented a significant step forward in mobile technology during its time and still holds a nostalgic place in the hearts of those who used it. Whether for capturing special moments or simply staying connected, the K700 catered to a diverse array of users, embodying the essence of early 2000s mobile innovation.
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