diff --git a/builtin/array.v b/builtin/array.v
index 21d8aea42d..154a158726 100644
--- a/builtin/array.v
+++ b/builtin/array.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 struct array {
diff --git a/builtin/builtin.v b/builtin/builtin.v
index 53a8c32055..3ce1d2d332 100644
--- a/builtin/builtin.v
+++ b/builtin/builtin.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 pub fn exit(reason string) {
diff --git a/builtin/int.v b/builtin/int.v
index c4813aaab5..8a97521a47 100644
--- a/builtin/int.v
+++ b/builtin/int.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 fn (d double) str() string {
diff --git a/builtin/map.v b/builtin/map.v
index c1f919b400..fdc420a0e2 100644
--- a/builtin/map.v
+++ b/builtin/map.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 struct map {
diff --git a/builtin/option.v b/builtin/option.v
index 1377c90abf..63d9f410b8 100644
--- a/builtin/option.v
+++ b/builtin/option.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 struct Option {
diff --git a/builtin/smap.v b/builtin/smap.v
index d87d089f56..455cd86aed 100644
--- a/builtin/smap.v
+++ b/builtin/smap.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 struct Entry2 {
diff --git a/builtin/string.v b/builtin/string.v
index f458b28818..c6f150a2ec 100644
--- a/builtin/string.v
+++ b/builtin/string.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 // V strings are not null-terminated.
diff --git a/builtin/string_builder.v b/builtin/string_builder.v
index d3ee8bf4f1..6fbc9847d1 100644
--- a/builtin/string_builder.v
+++ b/builtin/string_builder.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 struct StringBuilder {
diff --git a/builtin/string_test.v b/builtin/string_test.v
index b88867befa..c0356f71df 100644
--- a/builtin/string_test.v
+++ b/builtin/string_test.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 fn test_add() {
 	mut a := 'a'
 	a += 'b'
diff --git a/builtin/utf8.v b/builtin/utf8.v
index cf4137f798..c1f9971c04 100644
--- a/builtin/utf8.v
+++ b/builtin/utf8.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module builtin
 
 fn (s string) is_utf8() int {
diff --git a/compiler/cgen.v b/compiler/cgen.v
index 6de3c93441..8962cc828c 100644
--- a/compiler/cgen.v
+++ b/compiler/cgen.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 struct CGen {
diff --git a/compiler/fn.v b/compiler/fn.v
index cc7b8158a2..674f326e8e 100644
--- a/compiler/fn.v
+++ b/compiler/fn.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 const (
diff --git a/compiler/jsgen.v b/compiler/jsgen.v
index b3f356cfdf..8dd0dd5a5b 100644
--- a/compiler/jsgen.v
+++ b/compiler/jsgen.v
@@ -1,6 +1,7 @@
 // Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
 // Use of this source code is governed by an MIT license
 // that can be found in the LICENSE file.
+
 module main
 
 // TODO replace with comptime code generation.
diff --git a/compiler/main.v b/compiler/main.v
index 9fb7afd06e..97b9116c31 100644
--- a/compiler/main.v
+++ b/compiler/main.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 import os
diff --git a/compiler/parser.v b/compiler/parser.v
index 9c0f89d6e6..f116ae1023 100644
--- a/compiler/parser.v
+++ b/compiler/parser.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 import rand
diff --git a/compiler/scanner.v b/compiler/scanner.v
index fa95dcc161..4532b222d7 100644
--- a/compiler/scanner.v
+++ b/compiler/scanner.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 struct Scanner {
diff --git a/compiler/table.v b/compiler/table.v
index ac0710c7d3..7efcdb3aa5 100644
--- a/compiler/table.v
+++ b/compiler/table.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 struct Table {
diff --git a/compiler/token.v b/compiler/token.v
index 516ad65428..d3543e2280 100644
--- a/compiler/token.v
+++ b/compiler/token.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module main
 
 enum Token {
diff --git a/examples/hello_world.v b/examples/hello_world.v
index 341befc011..9bec065d9c 100644
--- a/examples/hello_world.v
+++ b/examples/hello_world.v
@@ -1 +1,5 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 println('Hello!')
diff --git a/examples/links_scraper.v b/examples/links_scraper.v
index f72d09365a..afacac41a8 100644
--- a/examples/links_scraper.v
+++ b/examples/links_scraper.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 import http
 
 fn main() {
diff --git a/examples/news_fetcher.v b/examples/news_fetcher.v
index 4fce584991..1ef9596241 100644
--- a/examples/news_fetcher.v
+++ b/examples/news_fetcher.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 import http
 import json
 import sync
diff --git a/examples/tetris/tetris.v b/examples/tetris/tetris.v
index 73c5a33dfa..0b6e23d8bf 100644
--- a/examples/tetris/tetris.v
+++ b/examples/tetris/tetris.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 import rand
 import time
 import gx
diff --git a/examples/word_counter/word_counter.v b/examples/word_counter/word_counter.v
index 18531187a7..a8f39c7823 100644
--- a/examples/word_counter/word_counter.v
+++ b/examples/word_counter/word_counter.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 import os
 
 fn main() {
diff --git a/gg/gg.v b/gg/gg.v
index cd43b8d895..3c909cf69f 100644
--- a/gg/gg.v
+++ b/gg/gg.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module gg
 
 import stbi
diff --git a/gl/1shader.v b/gl/1shader.v
index e878b292bf..ccf5f65b2d 100644
--- a/gl/1shader.v
+++ b/gl/1shader.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module gl
 
 import os
diff --git a/gl/gl.v b/gl/gl.v
index d9f41166bb..a3bcdb3014 100644
--- a/gl/gl.v
+++ b/gl/gl.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module gl
 
 import const (
diff --git a/glfw/glfw.v b/glfw/glfw.v
index d8bf32752d..186b8f57e0 100644
--- a/glfw/glfw.v
+++ b/glfw/glfw.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module glfw
 
 // Debugging a custom build
diff --git a/glm/glm.v b/glm/glm.v
index 4560829c4e..81b4906200 100644
--- a/glm/glm.v
+++ b/glm/glm.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module glm
 
 import math
diff --git a/gx/gx.v b/gx/gx.v
index 98e60580ab..2d682d4c9f 100644
--- a/gx/gx.v
+++ b/gx/gx.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module gx
 
 struct Color {
diff --git a/http/download_lin.v b/http/download_lin.v
index 2422214b3d..ebbc6cbbfc 100644
--- a/http/download_lin.v
+++ b/http/download_lin.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module http
 
 import os
diff --git a/http/download_mac.v b/http/download_mac.v
index 1df58873a1..57bb976fe5 100644
--- a/http/download_mac.v
+++ b/http/download_mac.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module http
 
 import os
diff --git a/http/download_win.v b/http/download_win.v
index 4af2fcc6e6..40f4c9f975 100644
--- a/http/download_win.v
+++ b/http/download_win.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module http
 
 fn download_file_with_progress(url, out string, cb, cb_finished voidptr) {
diff --git a/http/http.v b/http/http.v
index 8408a55e93..c6abc21521 100644
--- a/http/http.v
+++ b/http/http.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module http
 
 struct Request {
diff --git a/http/http_mac.v b/http/http_mac.v
index 82956d40ee..7088b297e6 100644
--- a/http/http_mac.v
+++ b/http/http_mac.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module http
 
 #include <curl/curl.h>
@@ -125,7 +129,7 @@ fn (req &Request) do() Response {
 		h := '$key: $val'
 		hlist = C.curl_slist_append(hlist, h.cstr())
 	}
-	// curl_easy_setopt(curl, CURLOPT_HTTP_VERSION,	// (long)CURL_HTTP_VERSION_2TLS);ô`CÒÊ€9À
+	// curl_easy_setopt(curl, CURLOPT_HTTP_VERSION,	// (long)CURL_HTTP_VERSION_2TLS);�`C�ʀ9�
 	C.curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1)
 	if req.verbose {
 		C.curl_easy_setopt(curl, CURLOPT_VERBOSE, 1)
diff --git a/http/http_win.v b/http/http_win.v
index c9cf0f2a7b..eae052ce65 100644
--- a/http/http_win.v
+++ b/http/http_win.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module http
 
 #flag -lwininet
diff --git a/json/json_primitives.v b/json/json_primitives.v
index b9b54574dc..108c916647 100644
--- a/json/json_primitives.v
+++ b/json/json_primitives.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module json
 
 // #include "json/cJSON/cJSON.c"
diff --git a/os/os.v b/os/os.v
index 4977bcf477..883883270f 100644
--- a/os/os.v
+++ b/os/os.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module os
 
 #include <sys/stat.h>
diff --git a/os/os_mac.v b/os/os_mac.v
index 1b066245f7..9684246e1e 100644
--- a/os/os_mac.v
+++ b/os/os_mac.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module os
 
 #include    <execinfo.h>
diff --git a/os/os_win.v b/os/os_win.v
index 9f888b62b9..df18d798e4 100644
--- a/os/os_win.v
+++ b/os/os_win.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module os
 
 fn ls(path string) []string {
diff --git a/rand/rand.v b/rand/rand.v
index fb43fad830..0260da44ae 100644
--- a/rand/rand.v
+++ b/rand/rand.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module rand
 
 #include <time.h>
diff --git a/stbi/stbi.v b/stbi/stbi.v
index 3f3e605110..78a5a1078a 100644
--- a/stbi/stbi.v
+++ b/stbi/stbi.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module stbi
 
 #include "glad.h"
diff --git a/sync/sync_mac.v b/sync/sync_mac.v
index ab4fa03523..3e20102659 100644
--- a/sync/sync_mac.v
+++ b/sync/sync_mac.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module sync
 
 #include <pthread.h>
diff --git a/sync/sync_win.v b/sync/sync_win.v
index aec69932d9..001e69e2f2 100644
--- a/sync/sync_win.v
+++ b/sync/sync_win.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module sync
 
 struct Mutex {
diff --git a/time/time.v b/time/time.v
index 37572edb89..a6ae9e08b0 100644
--- a/time/time.v
+++ b/time/time.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module time
 
 import rand
diff --git a/time/time_lin.v b/time/time_lin.v
index 1c2dba293e..9b1a3a27cf 100644
--- a/time/time_lin.v
+++ b/time/time_lin.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module time
 
 // in ms
diff --git a/time/time_mac.v b/time/time_mac.v
index efc17febb0..d20d2dae4c 100644
--- a/time/time_mac.v
+++ b/time/time_mac.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module time
 
 //#flag -framework CoreServices
diff --git a/time/time_win.v b/time/time_win.v
index f701b4d69e..fb0b151112 100644
--- a/time/time_win.v
+++ b/time/time_win.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module time
 
 // in ms