In all the figures generated from CFX-Post, there is a sign "CFX" at the right bottom corner. While this kind of "commercialism" is strictly banned by many research journals. Could anyone please tell me how to get rid of these signs? Thanks a lot in advance.

I believe it is not allow to take it away by contract, and that academics in any case are required to state which code they use when they publish and keep the tag. This is found both in the academics contract by CFX and stated in most serious reserach journals.