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A SWID tag is an ISO 19770-2 compliant XML file describing a software product. It is typically digitally signed by the software manufacturer to verify its validity. Ideally, for purposes of software asset management, the SWID tag will contain the digests (digital fingerprints) of each software file installed or placed on the device with the product.
NISTIR 8011 Vol. 3 under SWID Tag