Windows 8 Release Preview - key locked

Question

Windows

Good afternoon! Installed in May 2012 Windows 8 Release Preview.
The license agreement states that this system is operational until March 15, 2013.
Some time the computer with the test bench did not use.
Today I turned it on, it was necessary to use it, writes that it would be necessary to activate it.
the key was available from the site TK8TP-9JN6P-7X7WW-RFFTV-B7QPF

Now it says that the key is blocked, and does not activate again.
What could it be?

Answer 1

The other day there was an announcement that the CP / RP will expire in January and then an offer to buy an official or turn off once an hour. and no one needs RP/CP anymore

Answer 2

Well, apparently the key has expired, it's not given for life.