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Therefore, recipients of proprietary identifiers simply cannot rely on their persistence or accuracy for their own purposes. They can be used for matching purposes, though: if, for instance, title, main artist and proprietary ID of two entities are matches, then it might be legitimate to state that the two entities are the same.

 Note: the term “standardised” identifier here includes means formally standardised identifiers, but may also include proprietary identifiers where the allocating organisation has openly documented its criteria and is expected to not change them without notice.