/usr/share/horde/mnemo/lib/ is in php-horde-mnemo 4.2.12-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/horde/mnemo/lib/.htaccess
/usr/share/horde/mnemo/lib/Ajax/
/usr/share/horde/mnemo/lib/Ajax/Application.php
/usr/share/horde/mnemo/lib/Ajax/Imple/
/usr/share/horde/mnemo/lib/Ajax/Imple/EditNote.php
/usr/share/horde/mnemo/lib/Ajax/Imple/TagAutoCompleter.php
/usr/share/horde/mnemo/lib/Api.php
/usr/share/horde/mnemo/lib/Application.php
/usr/share/horde/mnemo/lib/Block/
/usr/share/horde/mnemo/lib/Block/Note.php
/usr/share/horde/mnemo/lib/Block/Summary.php
/usr/share/horde/mnemo/lib/Driver/
/usr/share/horde/mnemo/lib/Driver.php
/usr/share/horde/mnemo/lib/Driver/Kolab.php
/usr/share/horde/mnemo/lib/Driver/Sql.php
/usr/share/horde/mnemo/lib/Exception.php
/usr/share/horde/mnemo/lib/Factory/
/usr/share/horde/mnemo/lib/Factory/Driver.php
/usr/share/horde/mnemo/lib/Factory/Notepads.php
/usr/share/horde/mnemo/lib/Form/
/usr/share/horde/mnemo/lib/Form/CreateNotepad.php
/usr/share/horde/mnemo/lib/Form/DeleteNotepad.php
/usr/share/horde/mnemo/lib/Form/EditNotepad.php
/usr/share/horde/mnemo/lib/Form/Search.php
/usr/share/horde/mnemo/lib/Mnemo.php
/usr/share/horde/mnemo/lib/Notepads/
/usr/share/horde/mnemo/lib/Notepads/Base.php
/usr/share/horde/mnemo/lib/Notepads/Default.php
/usr/share/horde/mnemo/lib/Notepads/Kolab.php
/usr/share/horde/mnemo/lib/Tagger.php