Which of the following is NOT a common alteration to documents?

Watermarking is primarily a security feature that is intentionally added to documents to indicate authenticity or ownership. It is not an alteration in the sense of modifying or tampering with the original content of a document, but rather a protective measure that helps prevent forgery and counterfeiting.

In contrast, handwritten additions, erasures, and cut and paste techniques all involve some form of manipulation or alteration of the document's original state, which can be used to deceive or misrepresent information. Handwritten additions may involve adding false information; erasures might be used to remove critical data; and cut and paste refers to physically altering sections of a document to create a new or misleading version. These forms of alteration are commonly associated with fraudulent activity in document handling and verification.