diff --git a/cmd/release_config/release_config_lib/flag_artifact.go b/cmd/release_config/release_config_lib/flag_artifact.go
index 4446655f7..d6a629b10 100644
--- a/cmd/release_config/release_config_lib/flag_artifact.go
+++ b/cmd/release_config/release_config_lib/flag_artifact.go
@@ -36,6 +36,10 @@ type FlagArtifact struct {
 
 	// The value of the flag.
 	Value *rc_proto.Value
+
+	// This flag is redacted.  Set by UpdateValue when the FlagValue proto
+	// says to redact it.
+	Redacted bool
 }
 
 // Key is flag name.
@@ -85,6 +89,11 @@ func (src FlagArtifacts) Clone() (dst FlagArtifacts) {
 func (fa *FlagArtifact) UpdateValue(flagValue FlagValue) error {
 	name := *flagValue.proto.Name
 	fa.Traces = append(fa.Traces, &rc_proto.Tracepoint{Source: proto.String(flagValue.path), Value: flagValue.proto.Value})
+	if flagValue.proto.GetRedacted() {
+		fa.Redacted = true
+		fmt.Printf("Redacting flag %s in %s\n", name, flagValue.path)
+		return nil
+	}
 	if fa.Value.GetObsolete() {
 		return fmt.Errorf("Attempting to set obsolete flag %s. Trace=%v", name, fa.Traces)
 	}
@@ -111,6 +120,9 @@ func (fa *FlagArtifact) UpdateValue(flagValue FlagValue) error {
 
 // Marshal the FlagArtifact into a flag_artifact message.
 func (fa *FlagArtifact) Marshal() (*rc_proto.FlagArtifact, error) {
+	if fa.Redacted {
+		return nil, nil
+	}
 	return &rc_proto.FlagArtifact{
 		FlagDeclaration: fa.FlagDeclaration,
 		Value:           fa.Value,
diff --git a/cmd/release_config/release_config_lib/release_config.go b/cmd/release_config/release_config_lib/release_config.go
index c67cee54a..b08b6a339 100644
--- a/cmd/release_config/release_config_lib/release_config.go
+++ b/cmd/release_config/release_config_lib/release_config.go
@@ -150,22 +150,26 @@ func (config *ReleaseConfig) GenerateReleaseConfig(configs *ReleaseConfigs) erro
 		}
 		myDirsMap[contrib.DeclarationIndex] = true
 		for _, value := range contrib.FlagValues {
-			fa, ok := myFlags[*value.proto.Name]
+			name := *value.proto.Name
+			fa, ok := myFlags[name]
 			if !ok {
-				return fmt.Errorf("Setting value for undefined flag %s in %s\n", *value.proto.Name, value.path)
+				return fmt.Errorf("Setting value for undefined flag %s in %s\n", name, value.path)
 			}
 			myDirsMap[fa.DeclarationIndex] = true
 			if fa.DeclarationIndex > contrib.DeclarationIndex {
 				// Setting location is to the left of declaration.
-				return fmt.Errorf("Setting value for flag %s not allowed in %s\n", *value.proto.Name, value.path)
+				return fmt.Errorf("Setting value for flag %s not allowed in %s\n", name, value.path)
 			}
 			if isRoot && *fa.FlagDeclaration.Workflow != workflowManual {
 				// The "root" release config can only contain workflow: MANUAL flags.
-				return fmt.Errorf("Setting value for non-MANUAL flag %s is not allowed in %s", *value.proto.Name, value.path)
+				return fmt.Errorf("Setting value for non-MANUAL flag %s is not allowed in %s", name, value.path)
 			}
 			if err := fa.UpdateValue(*value); err != nil {
 				return err
 			}
+			if fa.Redacted {
+				delete(myFlags, name)
+			}
 		}
 	}
 	releaseAconfigValueSets.Value = &rc_proto.Value{Val: &rc_proto.Value_StringValue{strings.Join(myAconfigValueSets, " ")}}
diff --git a/cmd/release_config/release_config_lib/release_configs.go b/cmd/release_config/release_config_lib/release_configs.go
index 6efdb2f08..aba8cd2c2 100644
--- a/cmd/release_config/release_config_lib/release_configs.go
+++ b/cmd/release_config/release_config_lib/release_configs.go
@@ -160,6 +160,9 @@ func (configs *ReleaseConfigs) LoadReleaseConfigMap(path string, ConfigDirIndex
 		configs.FlagArtifacts[name].UpdateValue(
 			FlagValue{path: path, proto: rc_proto.FlagValue{
 				Name: proto.String(name), Value: flagDeclaration.Value}})
+		if configs.FlagArtifacts[name].Redacted {
+			return fmt.Errorf("%s may not be redacted by default.", *flagDeclaration.Name)
+		}
 		return nil
 	})
 	if err != nil {
diff --git a/cmd/release_config/release_config_proto/build_flags_out.pb.go b/cmd/release_config/release_config_proto/build_flags_out.pb.go
index 0372d633b..77e20698e 100644
--- a/cmd/release_config/release_config_proto/build_flags_out.pb.go
+++ b/cmd/release_config/release_config_proto/build_flags_out.pb.go
@@ -11,7 +11,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.33.0
+// 	protoc-gen-go v1.30.0
 // 	protoc        v3.21.12
 // source: build_flags_out.proto
 
diff --git a/cmd/release_config/release_config_proto/build_flags_src.pb.go b/cmd/release_config/release_config_proto/build_flags_src.pb.go
index d0c924dae..ca2005c4b 100644
--- a/cmd/release_config/release_config_proto/build_flags_src.pb.go
+++ b/cmd/release_config/release_config_proto/build_flags_src.pb.go
@@ -11,7 +11,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.33.0
+// 	protoc-gen-go v1.30.0
 // 	protoc        v3.21.12
 // source: build_flags_src.proto
 
@@ -385,6 +385,9 @@ type FlagValue struct {
 	Name *string `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
 	// Value for the flag
 	Value *Value `protobuf:"bytes,201,opt,name=value" json:"value,omitempty"`
+	// If true, the flag is completely removed from the release config as if
+	// never declared.
+	Redacted *bool `protobuf:"varint,202,opt,name=redacted" json:"redacted,omitempty"`
 }
 
 func (x *FlagValue) Reset() {
@@ -433,6 +436,13 @@ func (x *FlagValue) GetValue() *Value {
 	return nil
 }
 
+func (x *FlagValue) GetRedacted() bool {
+	if x != nil && x.Redacted != nil {
+		return *x.Redacted
+	}
+	return false
+}
+
 // This replaces $(call declare-release-config).
 type ReleaseConfig struct {
 	state         protoimpl.MessageState
@@ -663,52 +673,54 @@ var file_build_flags_src_proto_rawDesc = []byte{
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-	0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x74, 0x6f,
 }
 
 var (
diff --git a/cmd/release_config/release_config_proto/build_flags_src.proto b/cmd/release_config/release_config_proto/build_flags_src.proto
index c077f5cd8..92edc2a66 100644
--- a/cmd/release_config/release_config_proto/build_flags_src.proto
+++ b/cmd/release_config/release_config_proto/build_flags_src.proto
@@ -114,6 +114,10 @@ message flag_value {
 
   // Value for the flag
   optional value value = 201;
+
+  // If true, the flag is completely removed from the release config as if
+  // never declared.
+  optional bool redacted = 202;
 }
 
 // This replaces $(call declare-release-config).