/usr/lib/x86_64-linux-gnu/libdc.so is in libdc-dev 0.3.24~svn3121-2.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdc.so.5.0.0
/usr/lib/x86_64-linux-gnu/libdc.so.5.0.0