Perhaps a further password would be required, or, at any rate, some proof of identity.
( ( ( ( ( ( Perhaps ( ( a ( further password ) ) ( would ( be required ) ) ) ) , ) or ) , ) ( ( at ( any rate ) ) ( , ( ( some proof ) ( of identity ) ) ) ) ) . )
(ROOT (S (S (ADVP (RB Perhaps)) (NP (DT a) (JJ further) (NN password)) (VP (MD would) (VP (VB be) (VP (VBN required))))) (, ,) (CC or) (, ,) (S (PP (IN at) (NP (DT any) (NN rate))) (, ,) (NP (NP (DT some) (NN proof)) (PP (IN of) (NP (NN identity))))) (. .)))
Identity should be a minimum requirement.
( Identity ( ( should ( be ( a ( minimum requirement ) ) ) ) . ) )
(ROOT (S (NP (NNP Identity)) (VP (MD should) (VP (VB be) (NP (DT a) (JJ minimum) (NN requirement)))) (. .)))