When specifying an ACL for a bucket or object, you can use a canned ACL instead of specifying permission grants individually. A canned ACL is a predefined set of grants of permissions.
HCP has these canned ACLs:
•private — Grants full control to the bucket or object owner
•public-read — Grants full control to the bucket or object owner and read permission to all users
•public-read-write — Grants full control to the bucket or object owner and read and write permissions to all users
•authenticated-read — Grants full control to the bucket or object owner and read permission to all authenticated users
•bucket-owner-read — Grants full control over the object to the object owner and read permission to the bucket owner
•bucket-owner-full-control — Grants full control over the object to the bucket and object owner
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