Who should own project source files: the freelancer or client?

[Btaliat]

The final copy and the materials used in the making of the task should be with the freelancers until the last and final payment is done. You need to know more about how to hold the ace. Don't give anything out even based on trust. You should make sure that you collect all the money that you need to collect from the clients first before you release that has to do with the task out. What do you think?