Nokia TransACT N91 8GB Owner's Manual page 118

content, content owners may ask that such software's
ability to access new DRM protected content be revoked.
Revocation may also prevent renewal of such DRM
protected content already in your device. Revocation of
such DRM software does not affect the use of content
protected with other types of DRM or the use of non-
DRM-protected content.
To view activation keys for DRM protected content stored
in your device, press , and select Tools > Actv. keys
and from the following:
Valid keys—View keys that are connected to one or more
media files and keys whose validity period has not started
yet.
Invalid keys—View keys that are not valid; the time period
for using the media file is exceeded or there is a protected
media file in the device but no connected activation key.
Not in use—View keys that have no media files connected
to them in the device.
To buy more usage time or extend the usage period for a
media file, select an invalid activation key and Options >
Get activation key. Activation keys cannot be updated if
Web service message reception is disabled. See 'Web
service messages', p. 52.
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