thanjavu is a free font available for personal use as well as commercial use. you can use thanjavu font for any publishing work, digital or printed media.
Downloading and Installing The thanjavu Font
before installing thanjavu font you have to download thanjavu font and save on your hard drive. then unzip it using any program or windows / mac default options.
then right click on the ttf files named thanjavu.ttf and then click install.
or you can thanjavu font files (.ttf) inside "fonts" folder in System Drive > Windows > Fonts folder.