/usr/include/c/sidlx_rmi_SimpleTicket.h is in libsidl-dev 1.4.0.dfsg-8.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/c/../sidlx_rmi_SimpleTicket.h
/usr/include/c/../sidlx_rmi_SimpleTicket.h