/usr/share/perl5/Dpkg/Source/ is in libdpkg-perl 1.16.1.2ubuntu7.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Dpkg/Source/Archive.pm
/usr/share/perl5/Dpkg/Source/Functions.pm
/usr/share/perl5/Dpkg/Source/Package/
/usr/share/perl5/Dpkg/Source/Package.pm
/usr/share/perl5/Dpkg/Source/Package/V1.pm
/usr/share/perl5/Dpkg/Source/Package/V2.pm
/usr/share/perl5/Dpkg/Source/Package/V3/
/usr/share/perl5/Dpkg/Source/Package/V3/bzr.pm
/usr/share/perl5/Dpkg/Source/Package/V3/custom.pm
/usr/share/perl5/Dpkg/Source/Package/V3/git.pm
/usr/share/perl5/Dpkg/Source/Package/V3/native.pm
/usr/share/perl5/Dpkg/Source/Package/V3/quilt.pm
/usr/share/perl5/Dpkg/Source/Patch.pm