diff --git a/cmd/qrbill-api/api.go b/cmd/qrbill-api/api.go
index 7b9a0f6..9911e8d 100644
--- a/cmd/qrbill-api/api.go
+++ b/cmd/qrbill-api/api.go
@@ -1,3 +1,17 @@
+// Copyright 2020 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
+//
+//     https://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 (
diff --git a/cmd/qrbill-api/api_gokrazy.go b/cmd/qrbill-api/api_gokrazy.go
index 6304574..710338a 100644
--- a/cmd/qrbill-api/api_gokrazy.go
+++ b/cmd/qrbill-api/api_gokrazy.go
@@ -1,5 +1,19 @@
 // +build gokrazy
 
+// Copyright 2020 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
+//
+//     https://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
 
 func init() {
diff --git a/cmd/qrbill-api/debughtml.go b/cmd/qrbill-api/debughtml.go
index 2aa0e34..4ef56a7 100644
--- a/cmd/qrbill-api/debughtml.go
+++ b/cmd/qrbill-api/debughtml.go
@@ -1,3 +1,17 @@
+// Copyright 2020 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
+//
+//     https://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 (
diff --git a/docs/code-of-conduct.md b/docs/code-of-conduct.md
new file mode 100644
index 0000000..f8b12cb
--- /dev/null
+++ b/docs/code-of-conduct.md
@@ -0,0 +1,63 @@
+# Google Open Source Community Guidelines
+
+At Google, we recognize and celebrate the creativity and collaboration of open
+source contributors and the diversity of skills, experiences, cultures, and
+opinions they bring to the projects and communities they participate in.
+
+Every one of Google's open source projects and communities are inclusive
+environments, based on treating all individuals respectfully, regardless of
+gender identity and expression, sexual orientation, disabilities,
+neurodiversity, physical appearance, body size, ethnicity, nationality, race,
+age, religion, or similar personal characteristic.
+
+We value diverse opinions, but we value respectful behavior more.
+
+Respectful behavior includes:
+
+* Being considerate, kind, constructive, and helpful.
+* Not engaging in demeaning, discriminatory, harassing, hateful, sexualized, or
+  physically threatening behavior, speech, and imagery.
+* Not engaging in unwanted physical contact.
+
+Some Google open source projects [may adopt][] an explicit project code of
+conduct, which may have additional detailed expectations for participants. Most
+of those projects will use our [modified Contributor Covenant][].
+
+[may adopt]: https://opensource.google/docs/releasing/preparing/#conduct
+[modified Contributor Covenant]: https://opensource.google/docs/releasing/template/CODE_OF_CONDUCT/
+
+## Resolve peacefully
+
+We do not believe that all conflict is necessarily bad; healthy debate and
+disagreement often yields positive results. However, it is never okay to be
+disrespectful.
+
+If you see someone behaving disrespectfully, you are encouraged to address the
+behavior directly with those involved. Many issues can be resolved quickly and
+easily, and this gives people more control over the outcome of their dispute.
+If you are unable to resolve the matter for any reason, or if the behavior is
+threatening or harassing, report it. We are dedicated to providing an
+environment where participants feel welcome and safe.
+
+## Reporting problems
+
+Some Google open source projects may adopt a project-specific code of conduct.
+In those cases, a Google employee will be identified as the Project Steward,
+who will receive and handle reports of code of conduct violations. In the event
+that a project hasn’t identified a Project Steward, you can report problems by
+emailing opensource@google.com.
+
+We will investigate every complaint, but you may not receive a direct response.
+We will use our discretion in determining when and how to follow up on reported
+incidents, which may range from not taking action to permanent expulsion from
+the project and project-sponsored spaces. We will notify the accused of the
+report and provide them an opportunity to discuss it before any action is
+taken. The identity of the reporter will be omitted from the details of the
+report supplied to the accused. In potentially harmful situations, such as
+ongoing harassment or threats to anyone's safety, we may take action without
+notice.
+
+*This document was adapted from the [IndieWeb Code of Conduct][] and can also
+be found at <https://opensource.google/conduct/>.*
+
+[IndieWeb Code of Conduct]: https://indieweb.org/code-of-conduct
diff --git a/docs/contributing.md b/docs/contributing.md
new file mode 100644
index 0000000..654a071
--- /dev/null
+++ b/docs/contributing.md
@@ -0,0 +1,28 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution;
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+## Community Guidelines
+
+This project follows [Google's Open Source Community
+Guidelines](https://opensource.google/conduct/).
diff --git a/generate.go b/generate.go
index 5061248..1d31ef3 100644
--- a/generate.go
+++ b/generate.go
@@ -1,3 +1,17 @@
+// Copyright 2020 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
+//
+//     https://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 qrbill
 
-//go:generate sh -c "go run goembed.go -package qrbill -var swisscross third_party/swiss-cross/CH-Kreuz_7mm/CH-Kreuz_7mm.png > GENERATED_swisscross.go && gofmt -w GENERATED_swisscross.go"
+//go:generate sh -c "go run third_party/goembed/goembed.go -package qrbill -var swisscross third_party/swiss-cross/CH-Kreuz_7mm/CH-Kreuz_7mm.png > GENERATED_swisscross.go && gofmt -w GENERATED_swisscross.go"
diff --git a/qrbill.go b/qrbill.go
index 03e186a..221d959 100644
--- a/qrbill.go
+++ b/qrbill.go
@@ -1,3 +1,17 @@
+// Copyright 2020 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
+//
+//     https://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 qrbill implements the Swiss QR-bill standard.
 //
 // More specifically, the most recent standard version at the time of writing
diff --git a/qrcodegenerator.go b/qrcodegenerator.go
index b9800d2..936b186 100644
--- a/qrcodegenerator.go
+++ b/qrcodegenerator.go
@@ -1,3 +1,17 @@
+// Copyright 2020 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
+//
+//     https://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 qrbill
 
 import (
diff --git a/goembed.go b/third_party/goembed/goembed.go
similarity index 73%
rename from goembed.go
rename to third_party/goembed/goembed.go
index 73fbfb4..d6705f2 100644
--- a/goembed.go
+++ b/third_party/goembed/goembed.go
@@ -2,6 +2,35 @@
 
 // +build ignore
 
+// goembed - Embed data in Go source code
+// https://github.com/dsymonds/goembed
+//
+// Copyright 2013 David Symonds.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// * Neither the name of the author nor the names of its contributors may be used
+//   to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // goembed generates a Go source file from an input file.
 package main