code: public void showLicenseFile(InputStream licenseFile) {
          Object e = SelfExtract.class;
          if (licenseFile != null) {
              e = SelfExtractUtils.showLicenseFile(licenseFile);
          }
          if (e != null) {
              SelfExtract.err("licenseNotFound");
              System.exit(ReturnCode.UNREADABLE);
          }
      }
docs: Display the license file. If an error occurs reading or writing the
  license file, exit with a message
  
  @param licenseFile
  The license file to display