(QTL (DQL ``) (QTC (S (S (BASENP (NNP Congress)) (VP (VBD recognized) (SBAR (IN that) (S (BASENP (DT such) (NNS services)) (VP (VP (VP (MD could) (RB not)) (CC and) (VP (MD would) (RB not))) (VP (VB exist))))))) (SBAR (IN if) (S (BASENP (PRP they)) (VP (VP (VBD faced) (NP (BASENP (NN liability)) (PP (IN for) (BASENP (NN copyright) (NN infringement))))) (PP (VBN based) (PP (IN on) (NP (BASENP (NNS materials)) (SBAR (S (BASENP (NNS users)) (VP (VBD uploaded) (PP (TO to) (BASENP (PRPD their) (NNS services))))))))))))) (PERIOD .)))