KeyCAPTCHA

<h4>Free Variants of Using WordPress CAPTCHA – KeyCAPTCHA</h4>
<ol>
<li>Anti-spam protection. Social advertising. Monetization through commercial ads.</li>
<li>Anti-spam protection. Monetization through commercial ads.</li>
<li>Anti-spam protection. Social advertising.</li>
<li>Anti-spam protection without any ads.</li>
</ol>
<h4>Social Features:</h4>
<p>You may support charity funds by enabling social advertising in our CAPTCHA.<br />
Also you can earn money by specifying social and commercial advertising shares in CAPTCHA on your website.</p>
<h4>KeyCAPTCHA Unique Technologies</h4>
<ul>
<li>Instead of guessing symbols, our WordPress CAPTCHA offers visitors to complete an easy interactive task.</li>
<li>If CAPTCHA hasn’t been solved correctly, page refreshing doesn’t take place that allows the user not to fill in the form repeatedly. It occurs since there is an initial checkup of CAPTCHAs in our CAPTCHA servers before sending a filled-in form to the protected web server.</li>
<li>Our CAPTCHA also can be used even if your hosting provider blocks all outgoing connections.</li>
</ul>
<h4>Effective Anti-Spam Protection</h4>
<ul>
<li>The geo-cluster is used to operate our CAPTCHA service. Our geo-cluster includes the servers located in diverse European data centers. Some servers are in the special DDoS stable data centers in Switzerland to ensure trouble-free 24x7x365 mode service operation.</li>
<li>Our CAPTCHA blocks spammers using anonymizers or anonymous HTPP proxies to distribute a hand spam.</li>
<li>There is no info of correct CAPTCHA solution in the visitor’s browser.</li>
<li>CAPTCHA verification is processed by the our CAPTCHA servers.</li>
<li>Data transferring between your web server, the visitor’s browser and our CAPTCHA servers is protected by a digital signature.</li>
<li>112 to 165 bit variable length password is used to generate a digital signature.</li>
<li>Our CAPTCHA is a code executable in the visitor’s browser. It is not a static image as used in typical CAPTCHAs.</li>
<li>Having received our CAPTCHA, it’s virtually impossible to transfer it to third parties in order to run any task what spammers also do bypassing typical CAPTCHAs.</li>
<li>Probability of guessing the answer by submitting a random solution is 1 to 30,000,000.</li>
<li>CAPTCHA-used images are transferred encryptedly.</li>
</ul>
<h4>Integration with WordPress</h4>
<p>Our CAPTCHA protects the following forms:</p>
<ul>
<li>Registration form</li>
<li>Comment form</li>
<li>Login form</li>
<li>Lost password form</li>
<li>Contact Form 7</li>
</ul>
<p>Compatibility and Features:</p>
<ul>
<li>Supports Trackbacks and Pingbacks</li>
<li>Our CAPTCHA is compatible with BuddyPress plugin</li>
<li>Our CAPTCHA supports two operating modes: Flash and HTML5. HTML5 CAPTCHA mode is used in most modern browsers, such as Mozilla FireFox, Google Chrome, Safari, and also used in iPhone and iPad. The Flash mode has been developed to be used in Internet Explorer and Opera. While loading, CAPTCHA identifies its operating mode depending on the visitor’s browser.</li>
</ul>
<h4>ATTENTION</h4>
<p>To install our WordPress CAPTCHA you should follow instructions in Installation tab. Otherwise the CAPTCHA won’t work correctly.</p>
<h4>KeyCAPTCHA Affiliate Program</h4>
<p>KeyCAPTCHA Affiliate Program allows publishers as well as any Internet user to collect incomes. For more information on The KeyCAPTCHA Affiliate Program, go to http://keycaptcha.wordpress.com/captcha-for-site-owners/affiliate-program/</p>
<h3>ATTENTION</h3>
<p>To install our CAPTCHA you have to follow instructions in Installation tab. Otherwise the CAPTCHA won’t work correctly.</p>
<h3>KeyCAPTCHA Translation</h3>
<ul>
<li>Our CAPTCHA is available in Armenian</li>
<li>Our CAPTCHA is available in Bulgarian</li>
<li>Our CAPTCHA is available in Chinese</li>
<li>Our CAPTCHA is available in Czech</li>
<li>Our CAPTCHA is available in Danish</li>
<li>Our CAPTCHA is available in Dutch</li>
<li>Our CAPTCHA is available in English</li>
<li>Our CAPTCHA is available in Estonian</li>
<li>Our CAPTCHA is available in French</li>
<li>Our CAPTCHA is available in German</li>
<li>Our CAPTCHA is available in Greek</li>
<li>Our CAPTCHA is available in Hebrew</li>
<li>Our CAPTCHA is available in Hungarian</li>
<li>Our CAPTCHA is available in Italian</li>
<li>Our CAPTCHA is available in Lithuanian</li>
<li>Our CAPTCHA is available in Norwegian</li>
<li>Our CAPTCHA is available in Portuguese</li>
<li>Our CAPTCHA is available in Polish</li>
<li>Our CAPTCHA is available in Romanian</li>
<li>Our CAPTCHA is available in Russian</li>
<li>Our CAPTCHA is available in Slovak</li>
<li>Our CAPTCHA is available in Spanish</li>
<li>Our CAPTCHA is available in Swedish</li>
</ul>


KeyCAPTCHA – Social WordPress CAPTCHA

See this otherview (rus): https://intsystem.org/captcha/vzlom-keycaptcha/



It is unsecure

Our captcha is the free unique anti-spam solution. This captcha does not require any text typing. Moreover, the captcha contains social features.

Freemius

WP Chill

Silkalns

patrickposner

<h3>Password Protect Pages, Posts & Content in WordPress</h3>
<p>Passster is an all-in-one plugin to password protect pages, content, or your entire site in seconds—quick, secure, and easy to use.<br />
Passster offers three protection modes to cover every use case you may think of when it comes to password protecting your WordPress website.</p>
<p><span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/kjYklVLVFD8?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent&listType=playlist&list=PLM2tOjfhVrZdo_H26CV2I-UfdqpDWxo3D" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span></p>
<h3>Passster Pro – Even more protection features when making a purchase</h3>
<p><strong>Multiple Passwords & Password Lists</strong><br />
– Assign multiple passwords for different users.<br />
– Create and manage large password lists for easy control.</p>
<p><strong>Quick & Bulk Edit for Password Protection</strong><br />
– Use WordPress <strong>Quick Edit</strong> and <strong>Bulk Edit</strong> to protect multiple pages instantly.</p>
<p><strong>Unlock Content by User Role or Email</strong><br />
– Automatically grant access to specific users or email addresses.</p>
<p><strong>Password Expiration & Usage Limits</strong><br />
– Set passwords to expire after a number of uses, first use, or by a time limit (hours, days, weeks).<br />
– Track which passwords were used and when they will expire.</p>
<p><strong>Generate Unlock Links</strong><br />
– Create encrypted unlock links so users can access content without entering a password.<br />
– Automatically shorten links with <strong>Bit.ly</strong> for easy sharing.</p>
<p><strong>WooCommerce Protection & Sales</strong><br />
– Protect WooCommerce pages, products, and checkout with a password.<br />
– Sell access to protected content—generate and email passwords automatically after purchase.</p>
<p><strong>Detailed Password Usage Statistics</strong><br />
– Track when and how often passwords are used.<br />
– View first usage date, IP (optional), and browser details.</p>
<h3>Quick Comparison (Free vs. Pro)</h3>
<h3>Free Version:</h3>
<p>✔ Protect sections of pages using shortcodes or blocks.<br />
✔ Secure entire pages and posts.<br />
✔ Automatically protect child pages with a single click.<br />
✔ Lock down your entire site with a password.<br />
✔ Unlock protected content without refreshing the page.<br />
✔ Customize the design, labels, and descriptions of the password form.<br />
✔ Use cookies to grant access across multiple protected areas.</p>
<h3>Pro Version:</h3>
<p>✔ Everything in the free version, plus:<br />
✔ Protect content with <strong>multiple passwords</strong> or password lists.<br />
✔ Quickly set up password protection via Quick Edit or Bulk Edit.<br />
✔ Protect content using <strong>Google reCAPTCHA or hCAPTCHA</strong>.<br />
✔ Unlock protected content by <strong>user role or email</strong>.<br />
✔ Set passwords to <strong>expire</strong> based on usage limits or time intervals.<br />
✔ Generate encrypted <strong>unlock links</strong> for seamless access.<br />
✔ Track and prevent <strong>concurrent password sharing</strong>.<br />
✔ Secure <strong>WooCommerce products and store pages</strong>.<br />
✔ Sell access to protected content via <strong>WooCommerce integration</strong>.<br />
✔ Detailed statistics on password usage and lists.</p>
<p>Get it now on <a href="https://passster.com/" rel="nofollow ugc">passster.com/</a></p>
<h3>Documentation</h3>
<p>Learn more about this plugin <a href="https://passster.com/kb/" rel="nofollow ugc">in our official documentation</a></p>
<h3>Support</h3>
<ul>
<li>Free users: <a href="https://wordpress.org/support/plugin/content-protector/" rel="ugc">Ask in our forum</a></li>
<li>Pro users: <a href="https://passster.com/contact-us/?utm_source=wordpress.org&utm_medium=web&utm_campaign=description&utm_term=contact+us" rel="nofollow ugc">Get priority help</a></li>
</ul>


Passster – Password Protect Pages and Content


I'm not sure that updating the plugin is the only cause, but it is a cause of this problem: the correct password ceases to unlock the content after an update and says "security check failed" or something when attempting to authenticate.  This causes a periodic freak-out of my customer.  To fix it I have to add and take away the whole-page lock...I think...  It's hard to pinpoint what I actually do that makes it start working again.


Periodically doesn't unlock. Buggy

Password Protect Pages, Posts & Content in WordPress

KeyCAPTCHA – Social WordPress CAPTCHA vs Passster – Password Protect Pages and Content