The MCL Valluvan font is a Tamil font that was developed by the Tamil Nadu Government's Electronics Corporation (TNEB) in collaboration with the Tamil Computer Corporation. The font was designed to be used for official purposes, such as printing government documents, and was also intended for use in educational institutions.
That's correct. The free 53 version only contains common characters. For rare Sanskrit loanwords or complex conjuncts, you need the full commercial version (MCL Valluvan Pro).