Hello, I agree with what data-medics says, and I am not offensive either, but in DR field, some corresponding knowledge is really needed, there is no program that can repair damaged files of any file actually;
And for your third question, I think MRT tools could be a helper, but it can not decrypt all the models now; sometimes the encryption keys are indeed very important if you want to get the data back;
And for your last question, MRT products have two different versions--- Chinese version and the international version( English version), so if you can understand English, you can choose the international version.
What's more, in DR field, sometimes you do not need to recover data, you'll just need to repair/refurbish the disk, like shielding the bad heads, bad sectors; and MRT can even sheild the head of Seagate F3 disks, which is the leading technology in DR field, here is a link for your information:
viewtopic.php?f=28&t=33791 or you can go to our website for more information:
http://en.mrtlab.com/