White paper
G900c
48
August 2008
DRM
The Digital Rights Management (DRM) technology
enables the secure distribution, promotion, and
sale of digital media. Examples of such content
include screen savers, themes, ringtones, and
branded games (currently restricted to java games/
midlets only). In other words, content providers can
control how users may use different types of
content in devices, such as, mobile phones,
computers or PDAs. Content providers can also
control the use of content in related services, such
as MMS and download.
Sony Ericsson is actively focusing on technology
standardization for the DRM concept, and supports
the ongoing standardization work and activities of
the Open Mobile Alliance (OMA). 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 phones in the DRM area
and also result in a strong, competitive DRM
standard.
G900c supports the OMA DRM v1 standard.
FWL – Forward Lock
G900c supports OMA DRM Forward Lock. It is the
simplest OMA use case, with no special licences
defined. The content is provided in a single DRM
packaged file, thus protecting the content from
being distributed by the user. It enables a secure
means for the content provider to deliver/provide
content which incurs a charge. Forward Lock
content will normally be received by G900c as part
of an MMS message or via HTTP download. G900c
supports OMA Download. More information is
available at
www.sonyericsson.com/developer
.
CD – Combined Delivery
G900c supports OMA DRM Combined Delivery/
Forward Lock. Content and associated licences
are downloaded or delivered to the user as a single
DRM packaged file. This means that the content or
licence issuer controls to which extent the content
can be used. As with pure Forward Lock, the user
will be unable to distribute this content for use on
another device.
SD – Separate Delivery
G900c supports OMA DRM Separate Delivery.
Content and associated licences are received as
separate DRM packages, either simultaneously or
at different points in time. This enables the
distribution of content to other users – with the
same possibilities to control the use of the content
as exist with Combined Delivery/Forward Lock.
Distribution of content to other users will require
them to obtain licences from the licence issuer.
Protection properties
Content that is protected according to the OMA
DRM standard is given special properties:
• Content with Forward Lock or Combined Deliv-
ery protection cannot be further distributed
since the “Send to” option is disabled.
• All three types of protected content (FWL, CD
and SD) packages can be stored on a memory
card, thereby enabling storage of large amounts
of content.
• OMA DRM Combined Delivery/Forward Lock
protected content cannot be used in another
device other than the device it was saved on.
Only Separate Delivery packages can be used
on another device, after obtaining licences to
use the content on the new device. Licences to
use the content can never be distributed from
user to user (phone to phone). Licences always
have to be obtained directly from the licence
issuer.
DRM package
DRM packaging software is typically included in
the software used by the content provider. It is
used to create the DRM package according to the
OMA DRM v1 standard before it is delivered to the
phone, including content and associated licences.
In Japan, only files with SD protection for playback
will be accepted in the Media player and in some
European markets DRM content can be used only
for automated use/themes, such as ringtones.
