"Merula does not operate or manage any computer using VirtualBox or any Oracle software."
Not using it does not mean Oracle won't ask you money, buddy. You *may* use it, therefore you need to pay for it, see the whole Oracle licensing terms, particularly on virtualization.
/sarcasm
"When companies use their legal department as a profit center it is highly indicative that the products they claim they are incorporated to provide are no longer competitive in the marketplace,"
There's probably no way to phrase it any better. Everyone I know of is fucking off Oracle's abusing licensing terms, whatever the transformation/risks costs.
It'll take time but Oracle DB is dead in the water.