Self-Assessment > Select Client > Settings > Data Security 

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Help Guide

Password Protection has been added to Documents within the Self-Assessment module and can be enabled by heading to the Navigation above

Once there click the edit button which will allow you to Enable the document protection for the first time. Once enabled, you can then enable password protection for the following reports; SA100 PDF & Computation PDF.

Once enabled, use the Master Password section to setup the password which is unique for each client.