I always insisted on as-published, DRM-Free copies in all three formats -- mobi, ePub, and PDF. Along with my 10 physical copies. And wrote it into the contract. If you write it into the contract, it's viewed as a trivial thing and they give it to you. If you wait, some jerk somewhere in the bureaucracy will want to say no.
(of course, I also have my original marked-up copies in Word format, but they will inevitably have some differences with the as-published work.)
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