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PAdES LTV writers add the /DSS and, in the same revision, declare the ESIC developer extension in the catalog's /Extensions (ISO 32000-2 §7.12). Any catalog change outside a short key list was "document structure", so the signature such an update protects showed as invalid. /Extensions may now gain declarations after signing; one that was signed may still not change or go. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>