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It is a specific login designed to deliver a confidential document to a selected group of persons, who may, or may not, be Members of the RSGB.
The login will have a fixed password and username that is the same for everyone in the distribution group.
You will have been notified of these credentials in the email that contained the link to the resource you tried to access.
If you continue to experience problems accessing this resource, raise a support ticket with the RSGB Web & IT Helpdesk.