@Andy Williamson
You can use Framework Manager to apply data level security and/or Object security based on Cognos Groups. Data Level security will restrict what data a user can see. Object security will restrict what objects are available to a user when they author reports.
Data Modules currently do not support object level security, however with 11.1.1 you can apply data level security and hide columns or tables you do not want exposed to the end user using that data module.
Further details on Object and Data level security for Framework Manager can be found in the below link:
https://www.ibm.com/support/knowledgecenter/en/SSEP7J_11.1.0/com.ibm.swg.ba.cognos.ug_fm.doc/c_securityinframeworkmanager.html
Details on Data Level Security for Data Modules can be found in the below link:
https://www.ibm.com/support/knowledgecenter/en/SSEP7J_11.1.0/com.ibm.swg.ba.cognos.ca_mdlg.doc/t_ca_mdlg_secure_data.html
Also, here is a link to a blog post with a matrix on the functionality available for Data modules and Framework Manager
https://community.ibm.com/community/user/businessanalytics/blogs/michael-mcgeein/2019/05/15/starting-a-new-modelling-project-fm-or-data-module?CommunityKey=6b10df83-0b3c-4f92-8b1f-1fd80d0e7e58&tab=recentcommunityblogsdashboard
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