Copyright for helpdev source package in Oracular

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: helpdev
Source: https://gitlab.com/dpizetta/helpdev/

Files: *
Copyright: 2019 Daniel Cosmo Pizetta 
License: Expat and CC-BY-4.0
Comment:
 Code is licensed under Expat; images are licensed under CC-BY-4.0.

Files: debian/*
Copyright: 2020 Boyuan Yang 
License: public-domain
 The files are released into the Public Domain.

License: Expat
 Permission is hereby granted, free of charge, to any person obtaining a copy
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 The above copyright notice and this permission notice shall be included in
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 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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