Sorry, I cannot post a quote since this confirmation comes from the WAR-Europe beta forums ( which are NDA restricted ).
However ; I
can confirm that it is completely safe to give away your open beta key, if you were a closed beta tester or simply cannot make use of it.
Doing so will not imperil your headstart & bonus item keys.
CE pre-order open beta keys are just as safe to give away as SE ones.
This confirmation comes directly from the GOA staff, who are running the EU open beta.
I'm sure they won't mind this news being spread around, since more people in open beta = more potential customers.
So... anyone need an open beta key ?
P.S. Does anyone have a US CE pre-ordered from a retailer who
won't be providing them with a CE headstart key ?