ValueError: Invalid key size (104) for RC4.

Related to the pdf.metadata line from https://github.com/Unstructured-IO/unstructured-api/pull/249

ValueError: Invalid key size (104) for RC4
...
File "prepline_general/api/general.py", line 607, in response_generator
    response = pipeline_api(
  File "prepline_general/api/general.py", line 281, in pipeline_api
    pdf.metadata
  File "pypdf/_reader.py", line 388, in metadata
    obj = self.trailer[TK.INFO]
  File "pypdf/generic/_data_structures.py", line 320, in __getitem__
    return dict.__getitem__(self, key).get_object()
  File "pypdf/generic/_base.py", line 312, in get_object
    obj = self.pdf.get_object(self)
  File "pypdf/_reader.py", line 1410, in get_object
    retval = self._encryption.decrypt_object(
  File "pypdf/_encryption.py", line 845, in decrypt_object
    cf = self._make_crypt_filter(idnum, generation)
  File "pypdf/_encryption.py", line 917, in _make_crypt_filter
    stm_crypt = self._get_crypt(self.StmF, rc4_key, aes128_key, aes256_key)
  File "pypdf/_encryption.py", line 934, in _get_crypt
    return CryptRC4(rc4_key)
  File "pypdf/_crypt_providers/_cryptography.py", line 43, in __init__
    self.cipher = Cipher(ARC4(key), mode=None)
  File "cryptography/hazmat/primitives/ciphers/algorithms.py", line 143, in __init__
    self.key = _verify_key_size(self, key)
  File "cryptography/hazmat/primitives/ciphers/algorithms.py", line 20, in _verify_key_size
    raise ValueError(

Start by reproducing the traceback through prepline_general/api/general.py, especially pipeline_api and response_generator, then inspect pypdf/_reader.py, pypdf/_encryption.py, and pypdf/_crypt_providers/_cryptography.py around RC4 key construction. Done means the reported PDF metadata access no longer raises the invalid 104-bit RC4 key error, with the expected handling for that PDF established.