[Requires free registration.
( ( -LSB- Requires ) ( ( free registration ) . ) )
(ROOT (S (NP (NNP -LSB-) (NNP Requires)) (VP (VBP free) (NP (NN registration))) (. .)))
Does not require free registration. 
( ( ( Does not ) ( require ( free registration ) ) ) . )
(ROOT (S (VP (VBZ Does) (RB not) (VP (VB require) (NP (JJ free) (NN registration)))) (. .)))