Refined license file with debian specific format

Author: cmaglie

debian/Dockerfile

@@ -19,7 +19,7 @@ ARG GO_BINARY
 
 COPY ./debian/${DEB_NAME} /${DEB_NAME}/
 COPY ./${GO_BINARY} /${DEB_NAME}/usr/bin/${BINARY_NAME}
-COPY ./LICENSE.txt /${DEB_NAME}/usr/share/doc/copyright
+COPY ./debian/${DEB_NAME}/debian/copyright /${DEB_NAME}/usr/share/doc/copyright
 
 # Go application are tagged with `v` prefix, this remove the first v if present
 RUN export VERSION=$(echo "${VERSION}" | sed -e "s/^v\(.*\)/\1/") && \

debian/arduino-cli/DEBIAN/copyright

@@ -0,0 +1,18 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Source: https://github.com/arduino/arduino-cli
+Upstream-Name: arduino-cli
+
+Files:
+ *
+Copyright: Copyright 2020-2025 ARDUINO SA (http://www.arduino.cc/)
+License: GPL-3+ with exception
+ This software is released under the GNU General Public License version 3,
+ which covers the main part of arduino-cli.
+ The terms of this license can be found at:
+ https://www.gnu.org/licenses/gpl-3.0.en.html
+ .
+ You can be released from the requirements of the above licenses by purchasing
+ a commercial license. Buying such a license is mandatory if you want to
+ modify or otherwise use the software for commercial activities involving the
+ Arduino software without disclosing the source code of your own applications.
+ To purchase a commercial license, send an email to license@arduino.cc.