Every purchase of PRiV is safe. You can keep the coins on the exchanges or transfer them with calm on the wallets before the fork. Trading deposits and withdrawals all work regularly. The only recommendation that the team has made is to not make deposits and withdrawals, or send and receive coins while the fork will be in place. But before this happens, we will read further messages from the Team that will indicate exactly the block where the fork will be made. These further messages will be issued well in advance so that there are no risks for anyone.