/usr/lib/libdecodeqr.so.0 is in libdecodeqr0 0.9.3-6.2+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libdecodeqr.so.0.9.3
/usr/lib/libdecodeqr.so.0.9.3