[frud]

I used to work for a company that sold factory automation technology, and had hundreds of manuals for all the products they sold. In the front matter of every manual was a disclaimer that nothing in the manual was warranted to be true. This was automation equipment running things like steel mills, factories, petroleum plants, where failures could result in many deaths and grave financial losses.

[MichaelZuo]

I could see that for paper manuals or normal pdfs since once they leave the premises of the company anyone could alter the pages of the manual.