code: private function readRangeProtection()
      {
          $length = self::getUInt2d($this->data, $this->pos + 2);
          $recordData = $this->readRecordData($this->data, $this->pos + 4, $length);
  
          // move stream pointer to next record
          $this->pos += 4 + $length;
  
          // local pointer in record data
          $offset = 0;
  
          if (!$this->readDataOnly) {
              $offset += 12;
  
              // offset: 12; size: 2; shared feature type, 2 = enhanced protection, 4 = smart tag
              $isf = self::getUInt2d($recordData, 12);
              if ($isf != 2) {
                  // we only read FEAT records of type 2
                  return;
              }
              $offset += 2;
  
              $offset += 5;
  
              // offset: 19; size: 2; count of ref ranges this feature is on
              $cref = self::getUInt2d($recordData, 19);
              $offset += 2;
  
              $offset += 6;
  
              // offset: 27; size: 8 * $cref; list of cell ranges (like in hyperlink record)
              $cellRanges = [];
              for ($i = 0; $i < $cref; ++$i) {
                  try {
                      $cellRange = $this->readBIFF8CellRangeAddressFixed(substr($recordData, 27 + 8 * $i, 8));
                  } catch (PhpSpreadsheetException $e) {
                      return;
                  }
                  $cellRanges[] = $cellRange;
                  $offset += 8;
              }
  
              // offset: var; size: var; variable length of feature specific data
              $rgbFeat = substr($recordData, $offset);
              $offset += 4;
  
              // offset: var; size: 4; the encrypted password (only 16-bit although field is 32-bit)
              $wPassword = self::getInt4d($recordData, $offset);
              $offset += 4;
  
              // Apply range protection to sheet
              if ($cellRanges) {
                  $this->phpSheet->protectCells(implode(' ', $cellRanges), strtoupper(dechex($wPassword)), true);
              }
          }
      }
docs: Read RANGEPROTECTION record
  Reading of this record is based on Microsoft Office Excel 97-2000 Binary File Format Specification,
  where it is referred to as FEAT record.