/usr/lib/x86_64-linux-gnu/libenca.so is in libenca-dev 1.18-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libenca.so.0.5.1
/usr/lib/x86_64-linux-gnu/libenca.so.0.5.1