_:vb50818432 . _:vb50818433 . . _:vb50818433 . "PICS Signed Labels (DSig) 1.0 Specification" . _:vb50818432 "Brian LaMacchia" . "2009-11-24" . _:vb50818433 "Peter Lipp" . _:vb50818432 . _:vb50818430 . . _:vb50818431 "Philip DesAutels" . _:vb50818431 . . _:vb50818430 "Yanghua Chu" . _:vb50818431 . . _:vb50818430 . .