diff --git a/colors/example.ts b/colors/example.ts
index 02bc93432e..c6bbd614db 100644
--- a/colors/example.ts
+++ b/colors/example.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { bgBlue, red, bold, italic } from "./mod.ts";
 
 console.log(bgBlue(italic(red(bold("Hello world!")))));
diff --git a/colors/test.ts b/colors/test.ts
index f12f0cbb1f..bdce355234 100644
--- a/colors/test.ts
+++ b/colors/test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { assert, test } from "../testing/mod.ts";
 import { red, bgBlue, setEnabled, getEnabled } from "./mod.ts";
 import "./example.ts";
diff --git a/datetime/mod.ts b/datetime/mod.ts
index 5a967925d5..f30fc89c99 100644
--- a/datetime/mod.ts
+++ b/datetime/mod.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 export type DateFormat = "mm-dd-yyyy" | "dd-mm-yyyy" | "yyyy-mm-dd";
 
 /**
diff --git a/datetime/test.ts b/datetime/test.ts
index ce8193dfb3..65577420b1 100644
--- a/datetime/test.ts
+++ b/datetime/test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual, assert } from "../testing/mod.ts";
 import * as datetime from "mod.ts";
 
diff --git a/examples/cat.ts b/examples/cat.ts
index d8862d4249..38fdbb2cce 100644
--- a/examples/cat.ts
+++ b/examples/cat.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import * as deno from "deno";
 
 async function cat(filenames: string[]): Promise<void> {
diff --git a/examples/echo_server.ts b/examples/echo_server.ts
index 1d5b287db7..5776e77ef4 100644
--- a/examples/echo_server.ts
+++ b/examples/echo_server.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { listen, copy } from "deno";
 
 (async () => {
diff --git a/examples/gist.ts b/examples/gist.ts
index 1baff874ae..860678d88d 100755
--- a/examples/gist.ts
+++ b/examples/gist.ts
@@ -1,4 +1,5 @@
 #!/usr/bin/env deno --allow-net --allow-env
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
 import { args, env, exit, readFile } from "deno";
 import { parse } from "https://deno.land/x/flags/mod.ts";
diff --git a/examples/test.ts b/examples/test.ts
index 58013c70b5..79a90827ae 100644
--- a/examples/test.ts
+++ b/examples/test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { run } from "deno";
 import { test, assertEqual } from "../testing/mod.ts";
 
diff --git a/flags/example.ts b/flags/example.ts
index 5aa0a50345..54d64b6817 100644
--- a/flags/example.ts
+++ b/flags/example.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { args } from "deno";
 import { parse } from "./mod.ts";
 
diff --git a/flags/mod.ts b/flags/mod.ts
index 28a5c8eaca..2b91c2775d 100644
--- a/flags/mod.ts
+++ b/flags/mod.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 export interface ArgParsingOptions {
   unknown?: Function;
   boolean?: Boolean | string | string[];
diff --git a/flags/test.ts b/flags/test.ts
index fe4ec2c9fa..66aa8d2cd9 100644
--- a/flags/test.ts
+++ b/flags/test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import "./tests/all_bool.ts";
 import "./tests/bool.ts";
 import "./tests/dash.ts";
diff --git a/flags/tests/all_bool.ts b/flags/tests/all_bool.ts
index 07b12c2920..80e469f184 100755
--- a/flags/tests/all_bool.ts
+++ b/flags/tests/all_bool.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/bool.ts b/flags/tests/bool.ts
index 6fa014d8dd..6e3da2e737 100755
--- a/flags/tests/bool.ts
+++ b/flags/tests/bool.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/dash.ts b/flags/tests/dash.ts
index 6ab1a7d75a..d9f54c6928 100755
--- a/flags/tests/dash.ts
+++ b/flags/tests/dash.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/default_bool.ts b/flags/tests/default_bool.ts
index 82dab55386..ed5564715b 100755
--- a/flags/tests/default_bool.ts
+++ b/flags/tests/default_bool.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/dotted.ts b/flags/tests/dotted.ts
index 6b64e3b5e8..31b73c85d6 100755
--- a/flags/tests/dotted.ts
+++ b/flags/tests/dotted.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/kv_short.ts b/flags/tests/kv_short.ts
index 41853c1def..f2440919b3 100755
--- a/flags/tests/kv_short.ts
+++ b/flags/tests/kv_short.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/long.ts b/flags/tests/long.ts
index d75ece3b2d..9ea7df4719 100755
--- a/flags/tests/long.ts
+++ b/flags/tests/long.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/num.ts b/flags/tests/num.ts
index cc5b1b4e30..a3b564e7e2 100755
--- a/flags/tests/num.ts
+++ b/flags/tests/num.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/parse.ts b/flags/tests/parse.ts
index 2633357616..d6a1be709f 100755
--- a/flags/tests/parse.ts
+++ b/flags/tests/parse.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/short.ts b/flags/tests/short.ts
index fe89943948..84edd483eb 100755
--- a/flags/tests/short.ts
+++ b/flags/tests/short.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/stop_early.ts b/flags/tests/stop_early.ts
index aef4d5dc56..5e171accda 100755
--- a/flags/tests/stop_early.ts
+++ b/flags/tests/stop_early.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/unknown.ts b/flags/tests/unknown.ts
index e86f927965..ba1023dbe4 100755
--- a/flags/tests/unknown.ts
+++ b/flags/tests/unknown.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/flags/tests/whitespace.ts b/flags/tests/whitespace.ts
index 46ad094260..4dd9f9783d 100755
--- a/flags/tests/whitespace.ts
+++ b/flags/tests/whitespace.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assertEqual } from "../../testing/mod.ts";
 import { parse } from "../mod.ts";
 
diff --git a/fs/path.ts b/fs/path.ts
index 64390108d6..6ca0749c23 100644
--- a/fs/path.ts
+++ b/fs/path.ts
@@ -1,2 +1,3 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 export * from "./path/mod.ts";
 export * from "./path/interface.ts";
diff --git a/http/file_server.ts b/http/file_server.ts
index d1a34ab79a..1f3fdd5861 100755
--- a/http/file_server.ts
+++ b/http/file_server.ts
@@ -1,4 +1,5 @@
 #!/usr/bin/env deno --allow-net
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 
 // This program serves files in the current directory over HTTP.
 // TODO Stream responses instead of reading them into memory.
diff --git a/http/file_server_test.ts b/http/file_server_test.ts
index f8b2429b01..1b6613c15f 100644
--- a/http/file_server_test.ts
+++ b/http/file_server_test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { readFile, run } from "deno";
 
 import { test, assert, assertEqual } from "../testing/mod.ts";
diff --git a/http/http_bench.ts b/http/http_bench.ts
index 5aca12f55c..d80b2b103e 100644
--- a/http/http_bench.ts
+++ b/http/http_bench.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import * as deno from "deno";
 import { serve } from "./mod.ts";
 
diff --git a/http/http_status.ts b/http/http_status.ts
index a3006d319b..9ff212f296 100644
--- a/http/http_status.ts
+++ b/http/http_status.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 export enum Status {
   Continue = 100, // RFC 7231, 6.2.1
   SwitchingProtocols = 101, // RFC 7231, 6.2.2
diff --git a/http/server.ts b/http/server.ts
index fe25a5f6e1..723a345232 100644
--- a/http/server.ts
+++ b/http/server.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { listen, Conn, toAsyncIterator, Reader, copy } from "deno";
 import { BufReader, BufState, BufWriter } from "../io/bufio.ts";
 import { TextProtoReader } from "../textproto/mod.ts";
diff --git a/io/ioutil_test.ts b/io/ioutil_test.ts
index 422901e4a5..4ff69352a7 100644
--- a/io/ioutil_test.ts
+++ b/io/ioutil_test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { Reader, ReadResult } from "deno";
 import { assertEqual, test } from "../testing/mod.ts";
 import { readInt, readLong, readShort, sliceLongToBytes } from "./ioutil.ts";
diff --git a/io/util.ts b/io/util.ts
index 185732b366..8726a18879 100644
--- a/io/util.ts
+++ b/io/util.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { Buffer, Reader } from "deno";
 
 // `off` is the offset into `dst` where it will at which to begin writing values
diff --git a/io/util_test.ts b/io/util_test.ts
index 7318d887cc..90ae5d4c1b 100644
--- a/io/util_test.ts
+++ b/io/util_test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { test, assert } from "../testing/mod.ts";
 import { copyBytes } from "./util.ts";
 
diff --git a/log/handlers.ts b/log/handlers.ts
index c39102c8e8..9241bd77e4 100644
--- a/log/handlers.ts
+++ b/log/handlers.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { open, File, Writer } from "deno";
 import { getLevelByName } from "./levels.ts";
 import { LogRecord } from "./logger.ts";
diff --git a/log/handlers_test.ts b/log/handlers_test.ts
index bbdf6e0a50..52eca16ea5 100644
--- a/log/handlers_test.ts
+++ b/log/handlers_test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { assertEqual, test } from "../testing/mod.ts";
 import { LogRecord, Logger } from "./logger.ts";
 import { LogLevel, getLevelName, getLevelByName } from "./levels.ts";
diff --git a/log/levels.ts b/log/levels.ts
index 52d28aea5a..3fc8661618 100644
--- a/log/levels.ts
+++ b/log/levels.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 export const LogLevel = {
   NOTSET: 0,
   DEBUG: 10,
diff --git a/log/logger.ts b/log/logger.ts
index 9f34f9c325..678d5ed94d 100644
--- a/log/logger.ts
+++ b/log/logger.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { LogLevel, getLevelByName, getLevelName } from "./levels.ts";
 import { BaseHandler } from "./handlers.ts";
 
diff --git a/log/logger_test.ts b/log/logger_test.ts
index 2456e9fc24..a2275a00bd 100644
--- a/log/logger_test.ts
+++ b/log/logger_test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { assertEqual, test } from "../testing/mod.ts";
 import { LogRecord, Logger } from "./logger.ts";
 import { LogLevel } from "./levels.ts";
diff --git a/log/mod.ts b/log/mod.ts
index 821c2f82aa..96dc81ff1a 100644
--- a/log/mod.ts
+++ b/log/mod.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { Logger } from "./logger.ts";
 import {
   BaseHandler,
diff --git a/log/test.ts b/log/test.ts
index 3d803cc0c3..f9ab4222e1 100644
--- a/log/test.ts
+++ b/log/test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { assertEqual, test } from "../testing/mod.ts";
 import * as log from "./mod.ts";
 import { BaseHandler } from "./handlers.ts";
diff --git a/test.ts b/test.ts
index 07d825b625..0c4cf95b9c 100755
--- a/test.ts
+++ b/test.ts
@@ -1,4 +1,5 @@
 #!/usr/bin/env deno --allow-run --allow-net --allow-write
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import "colors/test.ts";
 import "datetime/test.ts";
 import "examples/test.ts";
diff --git a/ws/sha1_test.ts b/ws/sha1_test.ts
index 0b1e2c8583..865e443e5e 100644
--- a/ws/sha1_test.ts
+++ b/ws/sha1_test.ts
@@ -1,3 +1,4 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 import { assert, test } from "../testing/mod.ts";
 import { Sha1 } from "./sha1.ts";