The legality of the Reddy Anna book register in India depends on how it is used. Betting is a grey area in India, with laws varying from state to state. While some fantasy gaming platforms are legal under certain conditions, traditional betting is banned in many regions. Therefore, anyone using the Reddy Anna book register should first understand local laws and regulations. It's always recommended to use platforms that comply with legal norms and promote responsible gaming to avoid legal troubles or penalties.