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A DataSource can have several Access Levels:
Public - A public source that everyone using Glex has access to. These sources can not be modified by users.
Company Read - A source which is only available to your Tenant. These sources can not be modified by unless you are the source owner.
Company Write - A source which is only available to your Tenant, and can be modified by anyone in the Tenant.
Third Party - A source supplied and maintained by a third-party vendor. These sources can not be modified by users.
Private - A source only visible and modifiable by you.