/usr/share/perl5/X11/Protocol/ is in libx11-protocol-perl 0.56-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/X11/Protocol/Connection/
/usr/share/perl5/X11/Protocol/Connection.pm
/usr/share/perl5/X11/Protocol/Connection/FileHandle.pm
/usr/share/perl5/X11/Protocol/Connection/INETFH.pm
/usr/share/perl5/X11/Protocol/Connection/INETSocket.pm
/usr/share/perl5/X11/Protocol/Connection/Socket.pm
/usr/share/perl5/X11/Protocol/Connection/UNIXFH.pm
/usr/share/perl5/X11/Protocol/Connection/UNIXSocket.pm
/usr/share/perl5/X11/Protocol/Constants.pm
/usr/share/perl5/X11/Protocol/Ext/
/usr/share/perl5/X11/Protocol/Ext/BIG_REQUESTS.pm
/usr/share/perl5/X11/Protocol/Ext/DPMS.pm
/usr/share/perl5/X11/Protocol/Ext/RENDER.pm
/usr/share/perl5/X11/Protocol/Ext/SHAPE.pm
/usr/share/perl5/X11/Protocol/Ext/XC_MISC.pm
/usr/share/perl5/X11/Protocol/Ext/XFree86_Misc.pm