Only the object owner has permission to access these objects.
However, the object owner can optionally share objects with others by creating a presigned URL, using their own security credentials, to grant time-limited permission to download the objects.
When you create a presigned URL for your object, you must provide your security credentials, specify a bucket name, an object key, specify the HTTP method and expiration date and time.
The presigned URLs are valid only for the specified duration.
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Anyone who receives the presigned URL can then access the object.