Kalle wrote:

Why are you sure that this work? This does not prevent a browser to show a picture with a known direct link.

Because I did try it, and it works perfectly with Apache web server.

Kalle wrote:

Piwigo does not use php to send a picture to the browser, and the plugin "secure images" is not updated to Piwigo 2.4.3.

This sentence makes no sense. When you enter the picture's url directly in your webbrowser, the webserver is responsible for serving this image, not Piwigo. That's why you have to use some .htaccess or httpd.conf to tell Apache not to serve this directory to web clients. But Grum from Piwigo team already explained that in the first answers of this thread. Maybe you have an understanding problem? You guys nut?

With Microsoft IIS webserver it's another story.

What webserver is your site running on? People complaining here never answer that simple question. I can't believe you are publishing a website without knowing which web server you are using, or are you guys just trolls?

for securing the files with .htaccess

check [Forum, post 135239 by Michael in topic 20407] Security Issue - Photos always visible