DAM for Sitecore renders seo friendly media urls.
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By default we use assetname, which is the title of the asset in Digizuite DAM. If you want to disable this, leave the value empty or remove the pipeline.
All possible properties can be found in section 3.5 (stampvalue-asset) follow this link DFS 8.0.2 - 3 Render DAM for Sitecore Field Types