Most likely any of the four PIDs will work. An invalid checksum is sometimes because of 1 vs I or 0 vs O. A PID is 10 characters, the last two of which are the checksum of the first 8. Another common problem is that filenames with spaces must be in quotes.
The latest mobidedrm is (at least) version 0.16. A good source for DRM related info is Apprentice Alf's Blog. Its "tools_" package provides some easy to use wrappers for command line programs like mobidedrm.
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