What is ofd lock?

Consumer complaints and reviews about Ecom Express - delivery not received yet ofd lock applied since last 4 days. Consumer complaints and reviews about Ecom Express - ofd lock applied. Consumer complaints and reviews about Ecom Express - shipment not delivered and status updates as wrong address due to which rto lock. Ecom express is one of the worst courier I've ever come across. Also, it takes extra 8-10 days to LOCK RTO after customer refuses; Waste of extra time in managing RTO, tracking payments, re-addition of RTO. Open file description locks are useful in the same sorts of situations as process- associated locks.