If one is really concerned, then one should not use anything but scanned pdfs. It is possible to tinker, but not so easily.
The problem, as I see it, is taking any one book for the revealed truth. If you read enough on any subject, you will see what the major ideas or points of view are. If you read reviews of the work you are concerned about, they certainly would comment on how it differs from the author's previous point of view and offer suggestions why.
There are even multiple translations of the Bible. It is highly unlikely they will all be tinkered with.
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