yeah and it are save games which change every time.
... Again I think you fail to understand what I meant. If your talking about save games, same principle applies, calculate checksums for the save data, but store it in the save files header rather than an executables memory. The complexity of reclaulating checksums after modification is likely to put off most wanabe hackers.
However the point is, anyone will be able to get at your data, the question is simply; how long will it take them.