Controlling documents after implementation

Answer:
My interpretation of your question is: How can someone ensure that after implementation documents are not changed by users without authority to change them?
I see several approaches being used by organizations:
* Only digital versions are considered as valid. People access documentation through smartphones, tablets, terminals or computers, and documentation is protected from changes. And when someone prints a document a watermark appears saying that the organization does not control printed copies;
* Any printed version is only valid if signed by the authorized issuer;
* Frequent internal audits ensure that document control is learned and practiced

You can find more information about document control and ISO 9001 here:
- Article - New approach to document and record control in ISO 9001:2015 - https://advisera.com/9001academy/blog/2015/06/30/new-approach-to-document-and-record-control-in-iso-90012015/
- Free online course ISO 9001:2015 Internal Audito r Course - https://advisera.com/training/iso-9001-internal-auditor-course/
- Book - Discover ISO 9001:2015 Through Practical Examples - https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/