/usr/share/perl5/ is in biber 1.9-3+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Biber/
/usr/share/perl5/Biber/Section.pm
/usr/share/perl5/Biber/SortLists.pm
/usr/share/perl5/Biber/Entries.pm
/usr/share/perl5/Biber/Internals.pm
/usr/share/perl5/Biber/bcf.xsl
/usr/share/perl5/Biber/SortList.pm
/usr/share/perl5/Biber/biber-tool.conf
/usr/share/perl5/Biber/UCollate.pm
/usr/share/perl5/Biber/Constants.pm
/usr/share/perl5/Biber/biblatexml.rnc
/usr/share/perl5/Biber/DataModel.pm
/usr/share/perl5/Biber/biblatexml.rng
/usr/share/perl5/Biber/Input/
/usr/share/perl5/Biber/Input/file/
/usr/share/perl5/Biber/Input/file/bibtex.pm
/usr/share/perl5/Biber/Input/file/ris.pm
/usr/share/perl5/Biber/Input/file/biblatexml.pm
/usr/share/perl5/Biber/Input/file/zoterordfxml.pm
/usr/share/perl5/Biber/Input/file/endnotexml.pm
/usr/share/perl5/Biber/bcf.rng
/usr/share/perl5/Biber/Entry.pm
/usr/share/perl5/Biber/Utils.pm
/usr/share/perl5/Biber/config.rng
/usr/share/perl5/Biber/config.rnc
/usr/share/perl5/Biber/Sections.pm
/usr/share/perl5/Biber/Entry/
/usr/share/perl5/Biber/Entry/Name.pm
/usr/share/perl5/Biber/Entry/Names.pm
/usr/share/perl5/Biber/LaTeX/
/usr/share/perl5/Biber/LaTeX/Recode.pm
/usr/share/perl5/Biber/LaTeX/recode_data.xml
/usr/share/perl5/Biber/Output/
/usr/share/perl5/Biber/Output/bbl.pm
/usr/share/perl5/Biber/Output/bibtex.pm
/usr/share/perl5/Biber/Output/biblatexml.pm
/usr/share/perl5/Biber/Output/test.pm
/usr/share/perl5/Biber/Output/dot.pm
/usr/share/perl5/Biber/Output/base.pm
/usr/share/perl5/Biber/bcf.rnc
/usr/share/perl5/Biber/Config.pm
/usr/share/perl5/Unicode/
/usr/share/perl5/Unicode/Collate/
/usr/share/perl5/Unicode/Collate/latinkeys.txt
/usr/share/perl5/Biber.pm