https://lxr.kde.org/source/frameworks/kcontacts/LICENSES/Unicode-DFS-2016.txt?v=stable-kf6-qt6
/stable-kf6-qt6/frameworks/kcontacts/LICENSES/Unicode-DFS-2016.txt
KDE Source Cross Reference
stableframeworkskcontactslicensesunicode
https://lxr.kde.org/source/frameworks/kcontacts/src/secrecy.h?v=stable-kf5-qt5
/stable-kf5-qt5/frameworks/kcontacts/src/secrecy.h
KDE Source Cross Reference
stableframeworkskcontactssrcsecrecy
https://api.kde.org/org-kde-contacts-qmlmodule.html
KContacts QML Types | KContacts
Support for vCard contacts.
kcontactsqmltypes
https://lxr.kde.org/source/frameworks/kcontacts/src/improtocols/NOTE?v=kf5-qt5
/kf5-qt5/frameworks/kcontacts/src/improtocols/NOTE
KDE Source Cross Reference
frameworkskcontactssrcnote