After writing to dish tv on lock-in period, below is what I got as reply.
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Dear Subscriber,
Thank you for writing to us.
As per your request, we would like to inform you that lock-in period for HBO HD a-la-carte is 30 active days only.
Moreover, this offer is available on opt out basis i.e. you will have to self-nominate yourself to stop viewing this A-la-Carte after completion of lock-in period.
For any further assistance, please write to us by visiting at -http://www.dishtv.in/email-us.aspx
Thank you for choosing DishTV, We value your association and assure you of our commitment to serve you better.
Warm regards,
XXXXXXXXXXXXX
Customer Service
DISHTV