diff --git a/tools/download_file.py b/tools/download_file.py
index 8f790be..f62a43c 100755
--- a/tools/download_file.py
+++ b/tools/download_file.py
@@ -80,7 +80,6 @@
 opts.add_option('-v', help='expected content SHA-1')
 opts.add_option('-x', action='append', help='file to delete from ZIP')
 opts.add_option('--exclude_java_sources', action='store_true')
-opts.add_option('--unsign', action='store_true')
 args, _ = opts.parse_args()
 
 root_dir = args.o
@@ -138,18 +137,6 @@
     print('error opening %s: %s' % (cache_ent, err), file=stderr)
     exit(1)
 
-if args.unsign:
-  try:
-    with ZipFile(cache_ent, 'r') as zf:
-      for n in zf.namelist():
-        if (n.endswith('.RSA')
-            or n.endswith('.SF')
-            or n.endswith('.LIST')):
-          exclude.append(n)
-  except (BadZipfile, LargeZipFile) as err:
-    print('error opening %s: %s' % (cache_ent, err), file=stderr)
-    exit(1)
-
 safe_mkdirs(path.dirname(args.o))
 if exclude:
   try:
diff --git a/tools/maven_jar.bzl b/tools/maven_jar.bzl
index 5d12b67..fec3ea7 100644
--- a/tools/maven_jar.bzl
+++ b/tools/maven_jar.bzl
@@ -142,8 +142,6 @@
     args = [python, script, "-o", binjar_path, "-u", binurl]
     if ctx.attr.sha1:
         args.extend(["-v", ctx.attr.sha1])
-    if ctx.attr.unsign:
-        args.append("--unsign")
     for x in ctx.attr.exclude:
         args.extend(["-x", x])
 
@@ -170,7 +168,6 @@
         "repository": attr.string(default = MAVEN_CENTRAL),
         "sha1": attr.string(mandatory = False),
         "src_sha1": attr.string(),
-        "unsign": attr.bool(default = False),
         "exports": attr.string_list(),
         "deps": attr.string_list(),
         "_download_script": attr.label(default = Label("//tools:download_file.py")),