Members Access to Terrace in a Society

In Co-operative Housing Society at Borivali (W), Mumbai. Body members including Chairman and Secretary are denying the terrace access to other society member by stating that as per rules and under the shield of to avoid any unwelcome scenario like suicide. There's no notice circulated at all... and moreover if I ask for keys for my kids flying kites I am asked to give in writing that I will be responsible for any unforeseen scenarios if any.... Is this legally correct for society to restrict or members do have some rights to usage as per their convenience....