A drug manufacturing licence (commonly "ML") is a site-and-scope permission. It authorises a named premises, with named technical staff, to manufacture a named list of products or dosage forms. It is not a company-level credential. Change the address, change the competent technical person, or add a dosage form you were not licensed for, and you are outside the scope of the licence until an endorsement is granted.
That framing matters more than the paperwork. Most enforcement action against mid-sized manufacturers is not "you had no licence" — it is "you manufactured outside the scope of the one you had", or "the person named on the licence was not the person supervising the batch".
The scope is written into the licence itself as a schedule of categories: tablets, capsules, oral liquids, external preparations, dry powders, and so on. Sterile products, large volume parenterals, sera and vaccines sit in a separate, tighter category with mandatory central involvement.
Ayurvedic, Siddha and Unani manufacture runs on a parallel track under Rule 153 with Form 24D/25D, and cosmetics under Form 31/32. The mechanics below are broadly the same; the technical staff qualifications and GMP annexure differ.