This artifact originates from the Orbit Project at Eclipse, it is an osgi bundle and is signed as well.
'org.eclipse.jetty.orbit:com.sun.el:1.0.0.v201105211818'
<dependency>
<groupId>org.eclipse.jetty.orbit</groupId>
<artifactId>com.sun.el</artifactId>
<version>1.0.0.v201105211818</version>
</dependency>
<dependency org="org.eclipse.jetty.orbit" name="com.sun.el" rev="1.0.0.v201105211818"/>
"org.eclipse.jetty.orbit", "com.sun.el", "1.0.0.v201105211818"