diff --git a/tools/compliance/cmd/rtrace/rtrace.go b/tools/compliance/cmd/rtrace/rtrace.go
new file mode 100644
index 0000000..a2ff594
--- /dev/null
+++ b/tools/compliance/cmd/rtrace/rtrace.go
@@ -0,0 +1,185 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"android/soong/tools/compliance"
+)
+
+var (
+	sources         = newMultiString("rtrace", "Projects or metadata files to trace back from. (required; multiple allowed)")
+	stripPrefix     = flag.String("strip_prefix", "", "Prefix to remove from paths. i.e. path to root")
+
+	failNoneRequested = fmt.Errorf("\nNo license metadata files requested")
+	failNoSources     = fmt.Errorf("\nNo projects or metadata files to trace back from")
+	failNoLicenses    = fmt.Errorf("No licenses found")
+)
+
+type context struct {
+	sources         []string
+	stripPrefix     string
+}
+
+func init() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, `Usage: %s {options} file.meta_lic {file.meta_lic...}
+
+Outputs a space-separated Target ActsOn Origin Condition tuple for each
+resolution in the graph. When -dot flag given, outputs nodes and edges
+in graphviz directed graph format.
+
+If one or more '-c condition' conditions are given, outputs the
+resolution for the union of the conditions. Otherwise, outputs the
+resolution for all conditions.
+
+In plain text mode, when '-label_conditions' is requested, the Target
+and Origin have colon-separated license conditions appended:
+i.e. target:condition1:condition2 etc.
+
+Options:
+`, filepath.Base(os.Args[0]))
+		flag.PrintDefaults()
+	}
+}
+
+// newMultiString creates a flag that allows multiple values in an array.
+func newMultiString(name, usage string) *multiString {
+	var f multiString
+	flag.Var(&f, name, usage)
+	return &f
+}
+
+// multiString implements the flag `Value` interface for multiple strings.
+type multiString []string
+
+func (ms *multiString) String() string     { return strings.Join(*ms, ", ") }
+func (ms *multiString) Set(s string) error { *ms = append(*ms, s); return nil }
+
+func main() {
+	flag.Parse()
+
+	// Must specify at least one root target.
+	if flag.NArg() == 0 {
+		flag.Usage()
+		os.Exit(2)
+	}
+
+	if len(*sources) == 0 {
+		flag.Usage()
+		fmt.Fprintf(os.Stderr, "\nMust specify at least 1 --rtrace source.\n")
+		os.Exit(2)
+	}
+
+	ctx := &context{
+		sources:         *sources,
+		stripPrefix:     *stripPrefix,
+	}
+	_, err := traceRestricted(ctx, os.Stdout, os.Stderr, flag.Args()...)
+	if err != nil {
+		if err == failNoneRequested {
+			flag.Usage()
+		}
+		fmt.Fprintf(os.Stderr, "%s\n", err.Error())
+		os.Exit(1)
+	}
+	os.Exit(0)
+}
+
+// traceRestricted implements the rtrace utility.
+func traceRestricted(ctx *context, stdout, stderr io.Writer, files ...string) (*compliance.LicenseGraph, error) {
+	if len(files) < 1 {
+		return nil, failNoneRequested
+	}
+
+	if len(ctx.sources) < 1 {
+		return nil, failNoSources
+	}
+
+	// Read the license graph from the license metadata files (*.meta_lic).
+	licenseGraph, err := compliance.ReadLicenseGraph(os.DirFS("."), stderr, files)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to read license metadata file(s) %q: %v\n", files, err)
+	}
+	if licenseGraph == nil {
+		return nil, failNoLicenses
+	}
+
+	sourceMap := make(map[string]struct{})
+	for _, source := range ctx.sources {
+		sourceMap[source] = struct{}{}
+	}
+
+	compliance.TraceTopDownConditions(licenseGraph, func(tn *compliance.TargetNode) compliance.LicenseConditionSet {
+		if _, isPresent := sourceMap[tn.Name()]; isPresent {
+			return compliance.ImpliesRestricted
+		}
+		for _, project := range tn.Projects() {
+			if _, isPresent := sourceMap[project]; isPresent {
+				return compliance.ImpliesRestricted
+			}
+		}
+		return compliance.NewLicenseConditionSet()
+	})
+
+	// targetOut calculates the string to output for `target` adding `sep`-separated conditions as needed.
+	targetOut := func(target *compliance.TargetNode, sep string) string {
+		tOut := strings.TrimPrefix(target.Name(), ctx.stripPrefix)
+		return tOut
+	}
+
+	// outputResolution prints a resolution in the requested format to `stdout`, where one can read
+	// a resolution as `tname` resolves conditions named in `cnames`.
+	// `tname` is the name of the target the resolution traces back to.
+	// `cnames` is the list of conditions to resolve.
+	outputResolution := func(tname string, cnames []string) {
+		// ... one edge per line with names in a colon-separated tuple.
+		fmt.Fprintf(stdout, "%s %s\n", tname, strings.Join(cnames, ":"))
+	}
+
+	// Sort the resolutions by targetname for repeatability/stability.
+	actions := compliance.WalkResolutionsForCondition(licenseGraph, compliance.ImpliesShared).AllActions()
+	targets := make(compliance.TargetNodeList, 0, len(actions))
+	for tn := range actions {
+		if tn.LicenseConditions().MatchesAnySet(compliance.ImpliesRestricted) {
+			targets = append(targets, tn)
+		}
+	}
+	sort.Sort(targets)
+
+	// Output the sorted targets.
+	for _, target := range targets {
+		var tname string
+		tname = targetOut(target, ":")
+
+		// cnames accumulates the list of condition names originating at a single origin that apply to `target`.
+		cnames := target.LicenseConditions().Names()
+
+		// Output 1 line for each attachesTo+actsOn combination.
+		outputResolution(tname, cnames)
+	}
+	fmt.Fprintf(stdout, "restricted conditions trace to %d targets\n", len(targets))
+	if 0 == len(targets) {
+		fmt.Fprintln(stdout, "  (check for typos in project names or metadata files)")
+	}
+	return licenseGraph, nil
+}
diff --git a/tools/compliance/cmd/rtrace/rtrace_test.go b/tools/compliance/cmd/rtrace/rtrace_test.go
new file mode 100644
index 0000000..658aa96
--- /dev/null
+++ b/tools/compliance/cmd/rtrace/rtrace_test.go
@@ -0,0 +1,316 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	// Change into the parent directory before running the tests
+	// so they can find the testdata directory.
+	if err := os.Chdir(".."); err != nil {
+		fmt.Printf("failed to change to testdata directory: %s\n", err)
+		os.Exit(1)
+	}
+	os.Exit(m.Run())
+}
+
+func Test_plaintext(t *testing.T) {
+	tests := []struct {
+		condition   string
+		name        string
+		roots       []string
+		ctx         context
+		expectedOut []string
+	}{
+		{
+			condition: "firstparty",
+			name:      "apex",
+			roots:     []string{"highest.apex.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "firstparty",
+			name:      "apex_trimmed",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/firstparty/bin/bin1.meta_lic"},
+				stripPrefix: "testdata/firstparty/",
+			},
+			expectedOut: []string{},
+		},
+		{
+			condition: "firstparty",
+			name:      "container",
+			roots:     []string{"container.zip.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "firstparty",
+			name:      "application",
+			roots:     []string{"application.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "firstparty",
+			name:      "binary",
+			roots:     []string{"bin/bin1.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "firstparty",
+			name:      "library",
+			roots:     []string{"lib/libd.so.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "notice",
+			name:      "apex",
+			roots:     []string{"highest.apex.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "notice",
+			name:      "apex_trimmed",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/notice/bin/bin1.meta_lic"},
+				stripPrefix: "testdata/notice/",
+			},
+			expectedOut: []string{},
+		},
+		{
+			condition: "notice",
+			name:      "container",
+			roots:     []string{"container.zip.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "notice",
+			name:      "application",
+			roots:     []string{"application.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "notice",
+			name:      "binary",
+			roots:     []string{"bin/bin1.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "notice",
+			name:      "library",
+			roots:     []string{"lib/libd.so.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "reciprocal",
+			name:      "apex",
+			roots:     []string{"highest.apex.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "reciprocal",
+			name:      "apex_trimmed",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/reciprocal/bin/bin1.meta_lic"},
+				stripPrefix: "testdata/reciprocal/",
+			},
+			expectedOut: []string{},
+		},
+		{
+			condition: "reciprocal",
+			name:      "container",
+			roots:     []string{"container.zip.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "reciprocal",
+			name:      "application",
+			roots:     []string{"application.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "reciprocal",
+			name:      "binary",
+			roots:     []string{"bin/bin1.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "reciprocal",
+			name:      "library",
+			roots:     []string{"lib/libd.so.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "restricted",
+			name:      "apex",
+			roots:     []string{"highest.apex.meta_lic"},
+			expectedOut: []string{
+				"testdata/restricted/lib/liba.so.meta_lic restricted_allows_dynamic_linking",
+				"testdata/restricted/lib/libb.so.meta_lic restricted",
+			},
+		},
+		{
+			condition: "restricted",
+			name:      "apex_trimmed_bin1",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/restricted/bin/bin1.meta_lic"},
+				stripPrefix: "testdata/restricted/",
+			},
+			expectedOut: []string{"lib/liba.so.meta_lic restricted_allows_dynamic_linking"},
+		},
+		{
+			condition: "restricted",
+			name:      "apex_trimmed_bin2",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/restricted/bin/bin2.meta_lic"},
+				stripPrefix: "testdata/restricted/",
+			},
+			expectedOut: []string{"lib/libb.so.meta_lic restricted"},
+		},
+		{
+			condition: "restricted",
+			name:      "container",
+			roots:     []string{"container.zip.meta_lic"},
+			expectedOut: []string{
+				"testdata/restricted/lib/liba.so.meta_lic restricted_allows_dynamic_linking",
+				"testdata/restricted/lib/libb.so.meta_lic restricted",
+			},
+		},
+		{
+			condition: "restricted",
+			name:      "application",
+			roots:     []string{"application.meta_lic"},
+			expectedOut: []string{"testdata/restricted/lib/liba.so.meta_lic restricted_allows_dynamic_linking"},
+		},
+		{
+			condition: "restricted",
+			name:      "binary",
+			roots:     []string{"bin/bin1.meta_lic"},
+			expectedOut: []string{"testdata/restricted/lib/liba.so.meta_lic restricted_allows_dynamic_linking"},
+		},
+		{
+			condition: "restricted",
+			name:      "library",
+			roots:     []string{"lib/libd.so.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "proprietary",
+			name:      "apex",
+			roots:     []string{"highest.apex.meta_lic"},
+			expectedOut: []string{"testdata/proprietary/lib/libb.so.meta_lic restricted"},
+		},
+		{
+			condition: "proprietary",
+			name:      "apex_trimmed_bin1",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/proprietary/bin/bin1.meta_lic"},
+				stripPrefix: "testdata/proprietary/",
+			},
+			expectedOut: []string{},
+		},
+		{
+			condition: "proprietary",
+			name:      "apex_trimmed_bin2",
+			roots:     []string{"highest.apex.meta_lic"},
+			ctx: context{
+				sources:     []string{"testdata/proprietary/bin/bin2.meta_lic"},
+				stripPrefix: "testdata/proprietary/",
+			},
+			expectedOut: []string{"lib/libb.so.meta_lic restricted"},
+		},
+		{
+			condition: "proprietary",
+			name:      "container",
+			roots:     []string{"container.zip.meta_lic"},
+			expectedOut: []string{"testdata/proprietary/lib/libb.so.meta_lic restricted"},
+		},
+		{
+			condition: "proprietary",
+			name:      "application",
+			roots:     []string{"application.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "proprietary",
+			name:      "binary",
+			roots:     []string{"bin/bin1.meta_lic"},
+			expectedOut: []string{},
+		},
+		{
+			condition: "proprietary",
+			name:      "library",
+			roots:     []string{"lib/libd.so.meta_lic"},
+			expectedOut: []string{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.condition+" "+tt.name, func(t *testing.T) {
+			expectedOut := &bytes.Buffer{}
+			for _, eo := range tt.expectedOut {
+				expectedOut.WriteString(eo)
+				expectedOut.WriteString("\n")
+			}
+			fmt.Fprintf(expectedOut, "restricted conditions trace to %d targets\n", len(tt.expectedOut))
+			if 0 == len(tt.expectedOut) {
+				fmt.Fprintln(expectedOut, "  (check for typos in project names or metadata files)")
+			}
+
+			stdout := &bytes.Buffer{}
+			stderr := &bytes.Buffer{}
+
+			rootFiles := make([]string, 0, len(tt.roots))
+			for _, r := range tt.roots {
+				rootFiles = append(rootFiles, "testdata/"+tt.condition+"/"+r)
+			}
+			if len(tt.ctx.sources) < 1 {
+				tt.ctx.sources = rootFiles
+			}
+			_, err := traceRestricted(&tt.ctx, stdout, stderr, rootFiles...)
+			t.Logf("rtrace: stderr = %v", stderr)
+			t.Logf("rtrace: stdout = %v", stdout)
+			if err != nil {
+				t.Fatalf("rtrace: error = %v", err)
+				return
+			}
+			if stderr.Len() > 0 {
+				t.Errorf("rtrace: gotStderr = %v, want none", stderr)
+			}
+			out := stdout.String()
+			expected := expectedOut.String()
+			if out != expected {
+				outList := strings.Split(out, "\n")
+				expectedList := strings.Split(expected, "\n")
+				startLine := 0
+				for startLine < len(outList) && startLine < len(expectedList) && outList[startLine] == expectedList[startLine] {
+					startLine++
+				}
+				t.Errorf("rtrace: gotStdout = %v, want %v, somewhere near line %d Stdout = %v, want %v",
+					out, expected, startLine+1, outList[startLine], expectedList[startLine])
+			}
+		})
+	}
+}