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All objects by default are private. Only the object owner has permission to access these objects. However, the object owner can optionally share objects with others by creating a pre-signed URL, using their own security credentials, to grant time-limited permission to download the objects.
When you create a pre-signed URL for your object, you must provide your security credentials, specify a bucket name, an object key, specify the HTTP method (GET to download the object) and expiration date and time. The pre-signed URLs are valid only for the specified duration.
Anyone who receives the pre-signed URL can then access the object. For example, if you have a video in your bucket and both the bucket and the object are private, you can share the video with others by generating a pre-signed URL.
Anyone with valid security credentials can create a pre-signed URL. However, in order to successfully access an object, the pre-signed URL must be created by someone who has permission to perform the operation that the pre-signed URL is based upon.
You can generate pre-signed URL programmatically using the AWS SDK for Java and .NET.