/usr/share/doc/libcork-doc/html/_sources/ is in libcork-doc 0.15.0+ds-11.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libcork-doc/html/_sources/allocation.txt
/usr/share/doc/libcork-doc/html/_sources/array.txt
/usr/share/doc/libcork-doc/html/_sources/attributes.txt
/usr/share/doc/libcork-doc/html/_sources/basic-types.txt
/usr/share/doc/libcork-doc/html/_sources/bitset.txt
/usr/share/doc/libcork-doc/html/_sources/buffer.txt
/usr/share/doc/libcork-doc/html/_sources/byte-order.txt
/usr/share/doc/libcork-doc/html/_sources/cli.txt
/usr/share/doc/libcork-doc/html/_sources/config.txt
/usr/share/doc/libcork-doc/html/_sources/dllist.txt
/usr/share/doc/libcork-doc/html/_sources/ds.txt
/usr/share/doc/libcork-doc/html/_sources/errors.txt
/usr/share/doc/libcork-doc/html/_sources/files.txt
/usr/share/doc/libcork-doc/html/_sources/gc.txt
/usr/share/doc/libcork-doc/html/_sources/hash-table.txt
/usr/share/doc/libcork-doc/html/_sources/hash-values.txt
/usr/share/doc/libcork-doc/html/_sources/index.txt
/usr/share/doc/libcork-doc/html/_sources/int128.txt
/usr/share/doc/libcork-doc/html/_sources/managed-buffer.txt
/usr/share/doc/libcork-doc/html/_sources/mempool.txt
/usr/share/doc/libcork-doc/html/_sources/net-addresses.txt
/usr/share/doc/libcork-doc/html/_sources/process.txt
/usr/share/doc/libcork-doc/html/_sources/ring-buffer.txt
/usr/share/doc/libcork-doc/html/_sources/slice.txt
/usr/share/doc/libcork-doc/html/_sources/stream.txt
/usr/share/doc/libcork-doc/html/_sources/subprocess.txt
/usr/share/doc/libcork-doc/html/_sources/threads.txt
/usr/share/doc/libcork-doc/html/_sources/timestamps.txt
/usr/share/doc/libcork-doc/html/_sources/unique-ids.txt
/usr/share/doc/libcork-doc/html/_sources/versions.txt
/usr/share/doc/libcork-doc/html/_sources/visibility.txt