jojaba

This plugin makes it possible to restrict the access of posts contained in categories by setting a password and giving the impacted categories. The content and the excerpt of these posts are replaced by a password form that the user can fill out to get access. The WordPress generated feeds are modified (the description is replaced by a sentence that you can define).
Here’s the list of the settings (see screenshots for further infos):
<ul>
<li>Choose between session or cookie authentication</li>
<li>Set the password</li>
<li>Check the categories that has to be protected</li>
<li>Check the users granted to access the categories without password</li>
<li>Tell if the excerpt should be displayed or not in resources listing</li>
<li>Display a custom excerpt before password field</li>
<li>Set the info message that display before the password form</li>
<li>Set the placeholder in password field</li>
<li>Set the error message when typing the wrong password</li>
<li>Set the valdation button text</li>
<li>Set the text replacing the feed item description of protected posts</li>
<li>You can style the form using the available classes</li>
</ul>
Availabe languages : English (1.5), French (1.5), Simplified Chinese (thanks to Changmeng Hu, 1.4), German (1.4).
This plugin uses php Sessions (more secure) or a Cookie (less secure) to keep in mind the authenticated users. The password is crypted before it is stored. The regular feed content is filtered to avoid content display of restricted categories posts.

Access Category Password

protection type COOKIE is insecure.

If User set browser COOKIE, he can access protected posts.
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protection type がCOOKIEの場合は安全面に問題があります。

ある名称のCOOKIEをブラウザに埋め込めば保護された投稿にアクセス可能で、それはとても簡単にできます。

The protection type "COOKIE" is deprecated as insecure.

Protects posts in categories by setting a unique Password for all restricted categories.

GrandPlugins

Protect PDF files by passwords on your WordPress Website. 
PDF Password Protect plugin offers an easy way to set passwords and control edit permissions to your PDF files.
<h3>Features</h3>
<ul>
<li>Add user password to prevent opening the PDF file.</li>
<li>Add owner password to disabled PDF file edit permissions:</li>
</ul>
<h4>Permissions to disable</h4>
<ul>
<li>copy: copy text from PDF file.</li>
<li>print: print the PDF file.</li>
<li>comment: add comments to PDF file.</li>
<li>comment – fill form: Add comments and fill forms to PDF file.</li>
</ul>
<h3>For more features</h3>
👉 <a href="https://grandplugins.com/product/pdf-password-protect?utm_source=free" rel="nofollow ugc">Pro</a> | <a href="https://grandplugins.com/documentation/wp-pdf-password-protect/" rel="nofollow ugc">Docs</a> 👈
<ul>
<li>
Set passwords automatically to uploaded PDF files.
</li>
<li>
Set passwords to bulk PDF files.
</li>
<li>
Remove passwords from PDF files.
</li>
<li>
Overwrite PDF file owner password.
</li>
<li>
Restrict PDF files from view or download
</li>
<li>
Sell WooCommerce Downloadable PDFs protected with a password for each customer.
</li>
</ul>
<h3>Requirements</h3>
The plugin needs two packages to be installed on your server in order to handle complex PDF files that have forms – annotations – bookmarks and to handle some PDF files which use Compressed Cross-reference and Object Streams for data structure.
<ul>
<li>QPDF min V 9.1.1</li>
<li>GhostScript</li>
</ul>
<h3>How to use</h3>
<ul>
<li>Activate the plugin</li>
<li>Upload PDF file</li>
<li>Access the PDF attachment edit page from media page</li>
<li>You can add password to the PDF file from the Sidebar metabox “PDF password options”.</li>
</ul>
<h3>Check Our other plugins</h3>
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PDF Password Protect

Protect PDF files by passwords on your WordPress Website.

Access Category Password vs PDF Password Protect