The University Press offers copy editing for a fee. It is charged according to the time period. We recommend a stylistic editing especially when the work is by non-native German speakers. Following the example of American university presses, the publishing house recommends that PhDs are carefully fashioned with regard to the book publishing again, especially with regard to readability.
Of course the supervisor of the paper must agree to the submitted small changes made to the book version (the so-called imprimatur for a publication of a dissertation in a slightly different book version) in the event that the PhD regulations do not allow this anyway.