Owner/Admin Permissions: users automatically obtain owner permissions when they create artifacts. Administrator permissions are defined when you assign users to the Presto_Administrator built-in group (see Access/Create policies).
Owners have full permissions to all actions for the artifacts they create. Administrators have owner permissions for all artifacts.
You can also grant guest access to use artifacts. Guest access grants permission for anyone to run that artifact, even users who are not logged in. See Authentication and Guest Access for instructions.