[red_dragon]

You could disable the PID check and examine what mobidedrm expects. After making the changes you have to pass a 8 char PID to the python program:

(Be careful with the indentions)

	def __init__(self, data_file, pid):
### BEGIN NEW CODE ###
		# Calculate PID checksum if just the first 8 chars are specified
		if len(pid) == 8:
			pid = checksumPid(pid)
			print "Full PID is %s" % pid
### END NEW CODE ###
		if checksumPid(pid[0:-2]) != pid:
			raise DrmException("invalid PID checksum")
		pid = pid[0:-2]

Does it work for you?

If the decrypted result is garbage then your PID is not correct.

-Red Dragon