Using Parts of Another Company's Documentation to Supplement Your Company's Documentation
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Isenberg, Doug
TECHWR-L
2000

Abstract:

Although in some parts of life, as the saying goes, 'it's easier to ask forgiveness than to ask permission,' that's certainly not true in copyright law. It's very important to ask permission, because if you don't, you could be committing copyright infringement. In some instances, you may be able to use small portions of the other company's documentation without asking permission, under the 'fair use' doctrine of copyright law. However, this doctrine is highly fact-specific and often confusing; in other words, it's impossible to provide a blanket rule about how many paragraphs or words you can copy without violating the law.