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If the "Anonymous" group has "READ" access on the Item, then anonymous/public users will be able to view that Item's metadata and locate that Item via DSpace's search/browse system. In addition, search engines will also be able to index that Item's metadata. However, even with Anonymous READ set at the Item-level, you may still chose choose to access-restrict the downloading/viewing the of files within the Item. To do so, you would restrict "READ" access on individual Bitstream(s) attached to the Item.

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