Nextel comm I760 - Manual (Page 136)

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Digital Rights Management
About Expired Items
If you are using an item when it expires, once you
finish your session with the item, you will be unable
to use the item.
When ring tones and wallpapers expire, they are
automatically removed from their respective lists.
For expired items that continue to display in their
respective lists, you can either choose to renew the
license for the item or else manually delete the
item.
Note: You cannot delete locked items.