Non disclosure agreement and auditors

Answer:
Normally, organizations don’t require that certification bodies auditors sign non-disclosure agreements, since they have to keep professional confidentiality. However, if they will contact proprietary specifications, or proprietary processes, or information not intended for public knowledge, your organization can previously contact the certification body and request them to arrange things accordingly

The following material will provide you information about the classification of information:
- ISO 27001 – Information classification according to ISO 27001 - https://advisera.com/27001academy/blog/2014/05/12/information-classification-according-to-iso-27001/
- free online training ISO 9001:2015 Foundations Course – https://advisera.com/training/iso-9001-foundations-course/
- book - Discover ISO 9001:2015 Through Practical Examples - https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/

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This blog was... how do I say it? Relevant!! Finally I have found something which helped me.
Cheers!