/usr/share/doc/polyorb-doc/examples/corba/secure_echo/echo.idl is in polyorb-doc 2.11~20140418-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | interface Echo {
string echoString (in string Mesg);
};
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