. They were created before Unicode was widely adopted and use a custom encoding system. For example, when you type the letter sequence for a Tamil word using a tool like Azhagi, the software translates your keystrokes into the specific glyphs in the STMZH font file. This font file then displays the Tamil text, but the underlying data is not standard Tamil text. If you copy that text and paste it into another program that doesn't have the STMZH font installed, you'll see garbage characters or gibberish.
To type with an STMZH font, you'll need a typing tool like Azhagi , a 100% free software for Windows that acts as a bridge between your keyboard and the font: stmzh 062 senthamil font serial
Individual font files (such as .ttf or .otf files) do not have built-in serial number prompt boxes. You simply install them into your operating system's font directory. This font file then displays the Tamil text,