The safest place to get a clean, virus-free ZIP is through established Tamil computing forums or the official Kamban (a Tamil desktop publishing suite) archives.

Look for reputable Tamil software repositories or official typography sites. Avoid clicking on misleading "Download" buttons that are actually advertisements. Look for a direct link ending in .zip or .ttf.

Most NC Tamil fonts were originally shareware or freeware. However:

If you plan to redistribute the NC Tamil Fonts Collection ZIP, always include original license files.