 ** See Lucinda Southern, [https://digiday.com/uk/subscription-publishers-close-loopholes-paywall-blockers-emerge/ Incognito no more: Publishers close loopholes as paywall blockers emerge], ''DigiDay'', May 00, 0000. My paraphrase: At least for paywalled newspapers, the authentication hassle for paying customers is a bigger problem than gaps in the paywall that let skilled geeks enter without paying. + ** See Lucinda Southern, [https://digiday.com/uk/subscription-publishers-close-loopholes-paywall-blockers-emerge/ Incognito no more: Publishers close loopholes as paywall blockers emerge], ''DigiDay'', May 00, 0000