/usr/include/dislocker/ is in libdislocker0-dev 0.7.1-3build3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dislocker/accesses/
/usr/include/dislocker/accesses/accesses.h
/usr/include/dislocker/accesses/bek/
/usr/include/dislocker/accesses/bek/bekfile.h
/usr/include/dislocker/accesses/rp/
/usr/include/dislocker/accesses/rp/recovery_password.h
/usr/include/dislocker/accesses/stretch_key.h
/usr/include/dislocker/accesses/user_pass/
/usr/include/dislocker/accesses/user_pass/user_pass.h
/usr/include/dislocker/common.h
/usr/include/dislocker/config.h
/usr/include/dislocker/config.priv.h
/usr/include/dislocker/dislocker.h
/usr/include/dislocker/dislocker.priv.h
/usr/include/dislocker/encryption/
/usr/include/dislocker/encryption/aes-xts.h
/usr/include/dislocker/encryption/crc32.h
/usr/include/dislocker/encryption/decrypt.h
/usr/include/dislocker/encryption/diffuser.h
/usr/include/dislocker/encryption/encommon.h
/usr/include/dislocker/encryption/encommon.priv.h
/usr/include/dislocker/encryption/encrypt.h
/usr/include/dislocker/inouts/
/usr/include/dislocker/inouts/inouts.h
/usr/include/dislocker/inouts/inouts.priv.h
/usr/include/dislocker/inouts/prepare.h
/usr/include/dislocker/inouts/sectors.h
/usr/include/dislocker/metadata/
/usr/include/dislocker/metadata/datums.h
/usr/include/dislocker/metadata/extended_info.h
/usr/include/dislocker/metadata/fvek.h
/usr/include/dislocker/metadata/guid.h
/usr/include/dislocker/metadata/metadata.h
/usr/include/dislocker/metadata/metadata.priv.h
/usr/include/dislocker/metadata/metadata_config.h
/usr/include/dislocker/metadata/print_metadata.h
/usr/include/dislocker/metadata/vmk.h
/usr/include/dislocker/ntfs/
/usr/include/dislocker/ntfs/clock.h
/usr/include/dislocker/ntfs/encoding.h
/usr/include/dislocker/return_values.h
/usr/include/dislocker/ruby.h
/usr/include/dislocker/ssl_bindings.h
/usr/include/dislocker/ssl_bindings.h.in
/usr/include/dislocker/xstd/
/usr/include/dislocker/xstd/xstdio.h
/usr/include/dislocker/xstd/xstdlib.h
/usr/include/dislocker/xstd/xsys_select.h