clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
(* Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1996 University of Cambridge
*)
section {* Blanqui's "guard" concept: protocol-independent secrecy *}
theory Auth_Guard_Shared
imports
"Guard_OtwayRees"
"Guard_Yahalom"
begin
end