/usr/share/java/jetty8-security.jar is in libjetty8-java 8.1.16-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/jetty8-security-8.1.16.v20140903.jar
/usr/share/java/jetty8-security-8.1.16.v20140903.jar