Investigate if current implementation of --license-file is correct for Debian packages

While working on JDK-8214495 to verify if license file is working correctly I was not able to figure out how to read or how license file should be displayed to end user. I can see that we creating copyright file for Debian package, but I cannot see any license when installing package via Software Manager on Ubuntu or using command line command dpkg. Also, I was not able to find any references on system to license text provided.