1. It is not clear whether you ahve obtained copyright of the ' denim store' or not.
2.if you have no copyright and any other store having the similar brand name in sue prior to coming to your business then it may oppose you using the same brand name.
3.The matter would be more difficult if some other store has already have copyright of the name 'denim store'.
4.hence it is advisable that you register the name under Indian Copyright Act and then open the franchisee business.