If you bought DRM music from Yahoo, it will give you coupons or refunds if and when it becomes unplayable as a result of it shutting down its activation servers.
Yahoo Music Store closes on Sept. 30. After that date, customers can no longer re-authorize tracks. In the absence of a crack for its encryption system, this ties songs permanently to a single computer. Specifically, it warned uses that following the closure, they "will not be able to transfer songs to another computer or relicense these songs after changing operating systems."
The coupons will be redeemable at Rhapsody, Yahoo's new partner. A spokeswoman claims that only a "small number" of its customers are affected anyway – a quite believable assertion given the roaring success of Yahoo Music.
Microsoft recently agreed to delay killing its own DRM system after its own plans roused a similar teacupful of trouble.