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A safe harbor is a provision of a statute or a regulation that specifies that certain conduct will be deemed not to violate a given rule. It is usually found in connection with a more-vague, overall standard. (Wikipedia)

Does the safe harbor apply to all small businesses that provide disclosures voluntarily? (Cambridge Business English Dictionary)

What is a safe harbor rule? The term “safe harbor” means that through law, you're protected from a penalty when conditions are met. While the term applies to many areas of law, a major application of it is in taxation. (H&R Block)