@DiapDealer and @pdurrant
ok one more thing, if a bookstore or publisher is using ACS 4.0 then no new drm will be used. Even if the book first opens in ade 3.0 or ade 2.0!
I am not aware of the behavior of 4.1, I guess its not widely used.
I have explained how content server 4.2 and content server default 5.0 will behave. old + new drm based on first client.
And content server 5.0 in enforced mode will always use new DRM.
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