IDPF is 1040.
I am aware Adobe has one but I know nothing about it and don't really care to, the 1024 bug I initially had was from reading the spec at W3C page wrong, technical docs are bland and my eyes get tired, that's the only obfuscation algorithm for ePub I've read so I can't blame it on the Adobe spec.
Fortunately I didn't spend too much time figuring it out, when it didn't work I read the spec again and the 1040 jumped out at me.
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