public void unassignContent(UnassignContentParams params) {
    final UserEntity unassigner = securityService.getImpersonatedPortalUser();

    UnassignContentCommand command = new UnassignContentCommand();
    command.setContentKey(new ContentKey(params.contentKey));
    command.setUnassigner(unassigner.getKey());
    contentService.unassignContent(command);
  }