code: def add_parser(subparsers, parent_parser):
      UNPROTECT_HELP = (
          "Unprotect tracked files or directories (when hardlinks or symlinks "
          "have been enabled with `dvc config cache.type`)."
      )
      unprotect_parser = subparsers.add_parser(
          "unprotect",
          parents=[parent_parser],
          description=append_doc_link(UNPROTECT_HELP, "unprotect"),
          help=UNPROTECT_HELP,
          formatter_class=formatter.RawDescriptionHelpFormatter,
      )
      unprotect_parser.add_argument(
          "targets",
          nargs="+",
          help="Data files/directories to unprotect.",
      ).complete = completion.FILE
      unprotect_parser.set_defaults(func=CmdUnprotect)
  
file_path: dvc/dvc/commands/unprotect.py
imports: from dvc.cli import completion, formatter
  from dvc.cli.command import CmdBase
  from dvc.cli.utils import append_doc_link
  from dvc.exceptions import DvcException
  from dvc.log import logger
label_desc: Use image node_id 1 for calling a global function with example usage: add_parser(subparsers, parent_parser) without return types