How to embed a font in a webpage in a secure read-only mode?

I want to use this font, Luthier, for the main title of a Wordpress-based website.

The font’s license allows web-embedding only in a secure, read-only mode. I don’t know how to apply this read-only mode to the code, nor did I find reference of how to do it after searching the web.

Here’s the license item in question:

4_Embedding of the fonts into web pages or digital documents is permitted only in a secured, read-only mode

PS: If this should be in the GraphicDesign community, my apologies, please delete this question. Thanks.