code: @Override
      public ConcurrentMap<String, String> getProperties() {
  
          Map<String, String> props = AccessController.doPrivileged(new PrivilegedAction<Map<String, String>>() {
              @Override
              @Trivial
              public Map<String, String> run() {
                  return System.getenv();
              }
          });
  
          return new ConcurrentHashMap<>(props);
      }
docs: {@inheritDoc}