Letter of Credit is a common used payment type in international commercial contracts. It is a bank credit with safe advantages to the seller. In practice, the Letter of Credit is to be established and to reach the seller on month prior to the date of shipment so as to leave enough time for the seller to make preparations for shipment.
A lock-up period is a specified period of time after an investment during which shares cannot be redeemed or sold by the particular holder. The period is intended to stabilize share price or enhance investor confidence, either by preventing shares from flooding the market, keeping a fund from requiring high amounts of cash on hand or preventing certain key people from signalling to the market that they want to sell their positions during certain key times.