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The purpose is different when it is a matter of certifying or providing a qualified signature: If you certify a PDF document in Adobe, this means that you agree to the contents of this document. At the same time, you allow the document to be amended within a certain scope. If other changes are applied which you have not authorised, the document loses the certification. This means, for example, that you can create forms and limit the entries in these forms. A PDF with a qualified signature can no longer be changed after the signature. The qualified signature guarantees that a document has not been changed after the signature.