diff --git a/.mailmap b/.mailmap
new file mode 100644
index 000000000000..cc9834bb9fe5
--- /dev/null
+++ b/.mailmap
@@ -0,0 +1,12 @@
+Jeffrey Wilcke <jeffrey@ethereum.org>
+Jeffrey Wilcke <jeffrey@ethereum.org> <geffobscura@gmail.com>
+Jeffrey Wilcke <jeffrey@ethereum.org> <obscuren@obscura.com>
+Jeffrey Wilcke <jeffrey@ethereum.org> <obscuren@users.noreply.github.com>
+
+Viktor Trón <viktor.tron@gmail.com>
+
+Joseph Goulden <joegoulden@gmail.com>
+
+Nick Savers <nicksavers@gmail.com>
+
+Maran Hidskes <maran.hidskes@gmail.com>
\ No newline at end of file
diff --git a/update-license.go b/update-license.go
new file mode 100644
index 000000000000..d5e21fdd3f75
--- /dev/null
+++ b/update-license.go
@@ -0,0 +1,247 @@
+// +build none
+/*
+This command generates GPL license headers on top of all source files.
+You can run it once per month, before cutting a release or just
+whenever you feel like it.
+
+ go run update-license.go
+
+The copyright in each file is assigned to any authors for which git
+can find commits in the file's history. It will try to follow renames
+throughout history. The author names are mapped and deduplicated using
+the .mailmap file. You can use .mailmap to set the canonical name and
+address for each author. See git-shortlog(1) for an explanation
+of the .mailmap format.
+
+Please review the resulting diff to check whether the correct
+copyright assignments are performed.
+*/
+package main
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "io/ioutil"
+ "os"
+ "os/exec"
+ "path"
+ "regexp"
+ "runtime"
+ "sort"
+ "strings"
+ "sync"
+ "text/template"
+)
+
+var (
+ // only files with these extensions will be considered
+ extensions = []string{".go", ".js", ".qml"}
+
+ // paths with any of these prefixes will be skipped
+ skipPrefixes = []string{"tests/files/", "cmd/mist/assets/ext/", "cmd/mist/assets/muted/"}
+
+ // paths with this prefix are licensed as GPL. all other files are LGPL.
+ gplPrefixes = []string{"cmd/"}
+
+ // this regexp must match the entire license comment at the
+ // beginning of each file.
+ licenseCommentRE = regexp.MustCompile(`(?s)^/\*\s*(Copyright|This file is part of) .*?\*/\n*`)
+
+ // this line is used when git doesn't find any authors for a file
+ defaultCopyright = "Copyright (C) 2014 Jeffrey Wilcke <jeffrey@ethereum.org>"
+)
+
+// this template generates the license comment.
+// its input is an info structure.
+var licenseT = template.Must(template.New("").Parse(`/*
+ {{.Copyrights}}
+
+ This file is part of go-ethereum
+
+ go-ethereum is free software: you can redistribute it and/or modify
+ it under the terms of the GNU {{.License}} as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ go-ethereum is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU {{.License}} for more details.
+
+ You should have received a copy of the GNU {{.License}}
+ along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+`))
+
+type info struct {
+ file string
+ mode os.FileMode
+ authors map[string][]string // map keys are authors, values are years
+ gpl bool
+}
+
+func (i info) Copyrights() string {
+ var lines []string
+ for name, years := range i.authors {
+ lines = append(lines, "Copyright (C) "+strings.Join(years, ", ")+" "+name)
+ }
+ if len(lines) == 0 {
+ lines = []string{defaultCopyright}
+ }
+ sort.Strings(lines)
+ return strings.Join(lines, "\n\t")
+}
+
+func (i info) License() string {
+ if i.gpl {
+ return "General Public License"
+ } else {
+ return "Lesser General Public License"
+ }
+}
+
+func (i info) ShortLicense() string {
+ if i.gpl {
+ return "GPL"
+ } else {
+ return "LGPL"
+ }
+}
+
+func (i *info) addAuthorYear(name, year string) {
+ for _, y := range i.authors[name] {
+ if y == year {
+ return
+ }
+ }
+ i.authors[name] = append(i.authors[name], year)
+ sort.Strings(i.authors[name])
+}
+
+func main() {
+ files := make(chan string)
+ infos := make(chan *info)
+ wg := new(sync.WaitGroup)
+
+ go getFiles(files)
+ for i := runtime.NumCPU(); i >= 0; i-- {
+ // getting file info is slow and needs to be parallel
+ wg.Add(1)
+ go getInfo(files, infos, wg)
+ }
+ go func() { wg.Wait(); close(infos) }()
+ writeLicenses(infos)
+}
+
+func getFiles(out chan<- string) {
+ cmd := exec.Command("git", "ls-tree", "-r", "--name-only", "HEAD")
+ err := doLines(cmd, func(line string) {
+ for _, p := range skipPrefixes {
+ if strings.HasPrefix(line, p) {
+ return
+ }
+ }
+ ext := path.Ext(line)
+ for _, wantExt := range extensions {
+ if ext == wantExt {
+ goto send
+ }
+ }
+ return
+
+ send:
+ out <- line
+ })
+ if err != nil {
+ fmt.Println("error getting files:", err)
+ }
+ close(out)
+}
+
+func getInfo(files <-chan string, out chan<- *info, wg *sync.WaitGroup) {
+ for file := range files {
+ stat, err := os.Lstat(file)
+ if err != nil {
+ fmt.Printf("ERROR %s: %v\n", file, err)
+ continue
+ }
+ if !stat.Mode().IsRegular() {
+ continue
+ }
+ info, err := fileInfo(file)
+ if err != nil {
+ fmt.Printf("ERROR %s: %v\n", file, err)
+ continue
+ }
+ info.mode = stat.Mode()
+ out <- info
+ }
+ wg.Done()
+}
+
+func fileInfo(file string) (*info, error) {
+ info := &info{file: file, authors: make(map[string][]string)}
+ for _, p := range gplPrefixes {
+ if strings.HasPrefix(file, p) {
+ info.gpl = true
+ break
+ }
+ }
+ cmd := exec.Command("git", "log", "--follow", "--find-copies", "--pretty=format:%aI | %aN <%aE>", "--", file)
+ err := doLines(cmd, func(line string) {
+ sep := strings.IndexByte(line, '|')
+ year, name := line[:4], line[sep+2:]
+ info.addAuthorYear(name, year)
+ })
+ return info, err
+}
+
+func writeLicenses(infos <-chan *info) {
+ buf := new(bytes.Buffer)
+ for info := range infos {
+ content, err := ioutil.ReadFile(info.file)
+ if err != nil {
+ fmt.Printf("ERROR: couldn't read %s: %v\n", info.file, err)
+ continue
+ }
+
+ // construct new file content
+ buf.Reset()
+ licenseT.Execute(buf, info)
+ if m := licenseCommentRE.FindIndex(content); m != nil && m[0] == 0 {
+ buf.Write(content[m[1]:])
+ } else {
+ buf.Write(content)
+ }
+
+ if !bytes.Equal(content, buf.Bytes()) {
+ fmt.Println("writing", info.ShortLicense(), info.file)
+ if err := ioutil.WriteFile(info.file, buf.Bytes(), info.mode); err != nil {
+ fmt.Printf("ERROR: couldn't write %s: %v", info.file, err)
+ }
+ }
+ }
+}
+
+func doLines(cmd *exec.Cmd, f func(string)) error {
+ stdout, err := cmd.StdoutPipe()
+ if err != nil {
+ return err
+ }
+ if err := cmd.Start(); err != nil {
+ return err
+ }
+ s := bufio.NewScanner(stdout)
+ for s.Scan() {
+ f(s.Text())
+ }
+ if s.Err() != nil {
+ return s.Err()
+ }
+ if err := cmd.Wait(); err != nil {
+ return fmt.Errorf("%v (for %s)", err, strings.Join(cmd.Args, " "))
+ }
+ return nil
+}