/usr/share/perl5/Data/ICal/ is in libdata-ical-perl 0.18+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Data/ICal/Entry/
/usr/share/perl5/Data/ICal/Entry.pm
/usr/share/perl5/Data/ICal/Entry/Alarm/
/usr/share/perl5/Data/ICal/Entry/Alarm/Audio.pm
/usr/share/perl5/Data/ICal/Entry/Alarm/Display.pm
/usr/share/perl5/Data/ICal/Entry/Alarm/Email.pm
/usr/share/perl5/Data/ICal/Entry/Alarm/Procedure.pm
/usr/share/perl5/Data/ICal/Entry/Event.pm
/usr/share/perl5/Data/ICal/Entry/FreeBusy.pm
/usr/share/perl5/Data/ICal/Entry/Journal.pm
/usr/share/perl5/Data/ICal/Entry/TimeZone/
/usr/share/perl5/Data/ICal/Entry/TimeZone.pm
/usr/share/perl5/Data/ICal/Entry/TimeZone/Daylight.pm
/usr/share/perl5/Data/ICal/Entry/TimeZone/Standard.pm
/usr/share/perl5/Data/ICal/Entry/Todo.pm
/usr/share/perl5/Data/ICal/Property.pm