non-password-protected

「パスワードで保護されていない」。

例文は、本日のThe Ageの記事、'Google halts Street View Wi-Fi data collection'からです。

'Although Google has stated previously it did not collect any personal data, "it's now clear that we have been mistakenly collecting samples of payload data from open (ie non-password-protected) Wi-Fi networks," Eustace said'.