Here is all you need to know. It's against the ToS at FTP and when they catch you using it they can and will close your account and take your money.
PT3 and HEM work great at FTP.
Edit to add relevant section of the ToS
Players are not permitted to use the hand histories for hands that they have not personally participated in. Software designed to collect hand history information from games that the player did not participate in is prohibited. Some specific examples include: