Script to strip various iTunes atoms from purchased AAC files via AtomicParsley.

stripiT.rb

#!/usr/bin/env ruby

# usage: stripiT.rb
# the original files will be OVERWRITTEN.

# Script to remove extraneous/unwanted atoms from iTunes purchased files by way of AtomicParsley.
# Output should be comparable to the atoms left over after reencoding the file in iTunes itself.
# I only care about songs, so I have no clue how well this applies to video files
# Some information taken from: https://code.google.com/p/mp4v2/wiki/iTunesMetadata

# atoms to remove:
# moov.udta.meta.ilst.apID # apple account email address
# moov.udta.meta.ilst.ownr # apple account username
# moov.udta.meta.ilst.atID # artist-track ID
# moov.udta.meta.ilst.cnID # iTunes Catalog ID
# moov.udta.meta.ilst.geID # genre ID
# moov.udta.meta.ilst.plID # playlist ID (identifies album)
# moov.udta.meta.ilst.sfID # iTunes store identifier (location/number)
# moov.udta.meta.ilst.cprt # copyright information
# moov.udta.meta.ilst.flvr # bitrate/video size information?
# moov.udta.meta.ilst.purd # date purchased
# moov.udta.meta.ilst.rtng # Explicit/Clean information
# moov.udta.meta.ilst.soal # Album sort name
# moov.udta.meta.ilst.stik # media type information
# moov.udta.meta.ilst.xid  # vendor xID
# moov.udta.meta.ilst.----.name:[iTunMOVI] # some embedded plist thing, contains filesize and flavor.
# moov.trak.mdia.minf.stbl.stsd.mp4a.pinf # purchase information?

# Notes:
# [pinf] contains personal info, such as the name attached to the apple account.
# 	It requires --DeepScan to remove.
# [apID] contains the email address attached to the itunes account used to purchase.
# [purd] contains date/time of purchase
# [sfID] contains store information, including the country it was purchased in.

# Download AtomicParsley from here:
# https://bitbucket.org/wez/atomicparsley/overview

def processFile(f_path)
	command = "AtomicParsley \"#{f_path}\" --DeepScan --manualAtomRemove \"moov.trak.mdia.minf.stbl.stsd.mp4a.pinf\""
	["apID","ownr", "atID","cnID","geID","plID","sfID","cprt","flvr","purd","rtng","soal","stik","xid ","----.name:[iTunMOVI]"].each {|atom|
		command += " --manualAtomRemove \"moov.udta.meta.ilst.#{atom}\""
	}
	command += " -W"
	process = IO.popen( command )
	while ( status = process.gets )
		puts( status )
	end
end

path = File.expand_path('.')
if File.directory?(path)
  Dir.glob("#{path}/*.m4a").each do |f_path|
    puts("Processing: " + f_path)
    processFile(f_path)
  end
end