/usr/share/doc/libunicap2-dev/buildinfo_amd64.gz is in libunicap2-dev 0.9.12-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libunicap2-dev/../libunicap2/buildinfo_amd64.gz
/usr/share/doc/libunicap2-dev/../libunicap2/buildinfo_amd64.gz