chore(release): add eupl license and publishing instructions for v1.3.4

LICENSE.md

+# EUROPEAN UNION PUBLIC LICENCE v. 1.2
+
+## EUPL © the European Union 2007, 2016
+
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+this Licence or updated versions of the Appendix, so far this is required and
+reasonable, without reducing the scope of the rights granted by the Licence. New
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+
+All linguistic versions of this Licence, approved by the European Commission,
+have identical value. Parties can take advantage of the linguistic version of
+their choice.
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+14. Jurisdiction
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+Without prejudice to specific agreement between parties,
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+  business.
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+15. Applicable Law
+
+Without prejudice to specific agreement between parties,
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+- this Licence shall be governed by the law of the European Union Member State
+  where the Licensor has his seat, resides or has his registered office,
+
+- this licence shall be governed by Belgian law if the Licensor has no seat,
+  residence or registered office inside a European Union Member State.
+
+### Appendix
+
+‘Compatible Licences’ according to Article 5 EUPL are:
+
+- GNU General Public License (GPL) v. 2, v. 3
+- GNU Affero General Public License (AGPL) v. 3
+- Open Software License (OSL) v. 2.1, v. 3.0
+- Eclipse Public License (EPL) v. 1.0
+- CeCILL v. 2.0, v. 2.1
+- Mozilla Public Licence (MPL) v. 2
+- GNU Lesser General Public Licence (LGPL) v. 2.1, v. 3
+- Creative Commons Attribution-ShareAlike v. 3.0 Unported (CC BY-SA 3.0) for
+  works other than software
+- European Union Public Licence (EUPL) v. 1.1, v. 1.2
+- Québec Free and Open-Source Licence — Reciprocity (LiLiQ-R) or Strong
+  Reciprocity (LiLiQ-R+).
+
+The European Commission may update this Appendix to later versions of the above
+licences without producing a new version of the EUPL, as long as they provide
+the rights granted in Article 2 of this Licence and protect the covered Source
+Code from exclusive appropriation.
+
+All other changes or additions to this Appendix require the production of a new
+EUPL version.

README.md

@@ -45,3 +45,33 @@ doc.digitalCalibrationCertificate.administrativeData.coreData.uniqueIdentifier._
 // serialize the DCC
 console.log(doc.toXML()); // => <valid dcc xml>
 ```
+
+## License
+
+Copyright 2021 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, GERMANY
+Licensed under the EUPL, Version 1.2 or – as soon they will be approved by the European Commission - subsequent versions of the EUPL (the "Licence");
+
+You may not use this work except in compliance with the Licence.
+
+You may obtain a copy of the Licence at: https://joinup.ec.europa.eu/software/page/eupl
+
+Unless required by applicable law or agreed to in writing, software distributed under the Licence is
+distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+express or implied.
+
+See [the Licence](LICENSE.md) for the specific language governing permissions and limitations under the Licence.
+
+
+## Publishing this package
+
+Add the following to your `.npmrc`.
+```
+message="chore(release): bump version to v%s"
+# if you want to sign the tag
+sign-git-tag=true
+```
+
+1. Commit all changes
+2. Bump the version with `npm version [major | minor | patch | ...]`
+3. Push all commits to the remote
+4. Publish the package with `npm publish`

package.json

 {
   "name": "@d-ptb/dcc-js",
   "version": "1.3.4",
+  "license": "EUPL-1.2",
   "author": "Jan Loewe <jan.loewe@ptb.de>",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",