code: public void setSystemIds(java.util.Collection<String> systemIds) {
          if (systemIds == null) {
              this.systemIds = null;
              return;
          }
  
          this.systemIds = new java.util.ArrayList<String>(systemIds);
      }
docs: Relates to SPEKE implementation. DRM system identifiers. DASH output groups support a max of two system ids.
  Other group types support one system id.
  
  @param systemIds
  Relates to SPEKE implementation. DRM system identifiers. DASH output groups support a max of two system
  ids. Other group types support one system id.