DRM Combined Delivery and "Superdistribution"
NowSMS provides full support for OMA Digital Rights
Management (DRM) v1.0, with support for forward
lock, combined delivery and separate delivery.
"Forward Lock" is the most basic level of
DRM.
When "Forward Lock" is enabled, this indicates that
the receiving device should not allow any non-text
objects in the message to be forwarded off of the
device. The device may allow the user to extract
pictures, videos or sounds from the message and
save them on the phone. However, any such objects
remain forward locked, such that they cannot be
forwarded to another user or transferred to another
device
More advanced DRM restrictions can be applied to
limit the number of times that the user can access
an object, or start and end dates can be specified to
limit how long the user can access an object. The
restrictions can only be applied when using
either "Combined Delivery" or "Separate Delivery".
"Combined Delivery" means that both the
protected
object and the rights object are delivered
simultaneously. The protected object and its rights
object are packaged as a multipart/related MIME
object, which is usually retrieved by the receiving
client via HTTP download or as part of the content of
an MMS message.
"Separate Delivery" means that the
protected object
and the rights object are delivered separately. The
protected object is retrieved by the receiving client
via HTTP download or as part of the content of an
MMS message. However, the protected object is
locked and cannot be used until a rights object is
separately delivered. In this case, the rights object is
usually sent via WAP Push over SMS (sometimes
premium rate SMS).
"Superdistribution" is a DRM method that
allows the
original recipient to redistribute an encrypted DRM
content to other recipients. These new recipients
have to come back to the original content provider in
order to obtain rights to the
object. "Superdistribution" is facilitated
through "Separate Delivery".
You'll find more discussion of DRM and
superdistribution in the following thread on the
NowSMS discussion board.
Find out more....