EFILive, HPTuners, and various handheld tuners modify the seed/key as a way of locking the pcm. I am not sure exactly what they do, I think it changes the location the data is stored at. When I try to access it with software I do have it shows finding the original seed but key it generates does not match. I have been able to put together that key algorithm for ls pcms is:

KEY = 934D - SwapHiLo(Seed)
So the formula goes like this
SEED = 0A69
KEY = 934D - SwapHiLo(SEED)
KEY = 934D - SwapHiLo(0A69)
KEY = 934D - 690A
KEY = 2A43
If resulting number is negative, use 1934d.

http://www.miniwebtool.com/hex-calculator/