Well, using the guides found in a vast number of threads (here are
some of mine), you'll see how to specify a different font for an ePub file.
Now, using the knowledge shared by
kiklop74, I've learned how to access the default fonts (one of which you just replaced with Caecilia).
So, I think that if you enter the following code in the relevent option dialog in Calibre (i.e. conversion/look & feel/override css), it'll do the trick :
Code:
@font-face {font-family: "serif1";src:url(res:///opt/sony/ebook/FONT/tt0011m_.ttf)}
@font-face {font-family: "monospace1";src:url(res:///opt/sony/ebook/FONT/tt0419m_.ttf)}
@font-face {font-family: "sans1";src:url(res:///opt/sony/ebook/FONT/tt0003m_.ttf)}
body {
text-align: justify;
font-family: "serif1", serif;
font-size:9pt;
margin-left:1.5em;
margin-right:1.5em
}
Let me know if it works !
Cheers,
David.