1) Can anyone tell me the official term for the codes (letters and numbers) that are printed on the underside of the inner ring of a DVD, and is it agreed that this is a sure-fire way to authenticate a DVD?
2) Re: Jungle Book Limited Issue purchase - I bought it on eBay - the cover and disc art did seem 'off' and slightly different, but the seller provided extra pictures and told me she bought it years ago for her son, so it put me somewhat at ease. When it arrived, the print quality on the packaging was definitely suspicious. The insert that came with it (DVD offer) was riddled with misspellings (ie 101 Damnations

So, all signs point to 'bootleg' -- but here's where it gets tricky: the code on the underside of the dvd in question does mostly match one that I do believe is authentic.
A code from a disc I believe to be authentic reads: (E4806) E3509 with a tiny code that reads: IFPI LI30 (not sure if they are I's or 1's) -- It also has a bar code written around part of the inner ring.
My eBay disc in question has the same code as above ( (E4806) E3509 ), but is missing the tiny IFPI code. It also has a different-looking bar code.
If pictures would be helpful, I can upload some, but based on the info I have provided, does this sound like a (fairly high-quality) bootleg? And is the underside code the best way to authenticate future purchases?
Thanks in advance -- Mark