Let's say the Tester wants to send a Security Access request, but the "Seed" response is very long.
Never use software to remove watermarks from an official PDF. It violates the license agreement and can lead to legal action from your national standards body.
Note: I assume you mean ISO 14229 (Unified Diagnostic Services, UDS). ISO 14229-3 is one part of that series; if you meant a different part, say which and I’ll adjust.