Who can file trademark opposition

As far as Trademark Opposition in India is concerned, Section 21 of the Trademarks Act, 1999 says that "any person" who wants to oppose a trademark application can do so by filing a Trademark Opposition.

• An applicant must have trademark registered for filing opposition
• Any entity/consumer/buyer/purchaser/ likely to use goods.
• If the mark is contrary to the law or prohibited under the Emblem and Names Act, 1950.
• If the mark contains matters related to hurting any religious sentiments of any class or section of people.