What must always be done when producing a new classified document using information from a source document?

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When producing a new classified document using information from a source document, it is crucial to use the same classification level as the source document. This ensures that the new document reflects the same level of sensitivity and handling requirements as the original material. The classification level is determined based on the information's potential to cause harm to national security if disclosed. Therefore, maintaining the same classification level is essential to properly protect the information in accordance with established security protocols.

While changing classification markings, summarizing differently, or removing data may have specific applications depending on the situation, they do not guarantee that the new document will remain compliant with information security requirements. Using the same classification level helps to maintain consistency in how sensitive information is treated across different documents, ensuring that all handling and access requirements are met appropriately.