Thumbnail Image Extractions
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You can always extract thumbnail images from protected DGNs (including i-models and packaged i-models) in the datasource when those documents have Everyone Protection, however by default you cannot extract thumbnail images from protected DGNs in the datasource when those documents have Password or Certificate Protection. If necessary, administrators can allow thumbnail images to be extracted from password or certificate protected documents by setting the following configuration variable:
MS_PROTECTION_NOENCRYPT_THUMBNAIL=1