Clicking the 'attribute exclusions' link next to a group will take you to the Group Attribute Exclusions page. Here you are able to exclude access to certain assets based on the attribute values of that asset.
This is a useful way of hiding certain assets from groups of users, in addition to the general folder permissions structure. There are three attributes in a default Asset Bank that relate to this functionality - "Active Status", "Activation Date", and "Expiration Date". The standard behaviour is that your public and logged in users cannot see assets where the Active Status is set to "Inactive" or "Expired". It is possible to change the Active Status from Inactive to Active, and Active to Expired, using the two aforementioned date attributes. This means you can hide an asset when a specific date (the Expiration Date) is met.
On the Group Attribute Exclusions page you will see a list of qualifying attributes and their potential values. Put a tick next to each value for which you would like the asset to be invisible to users in this group. For example, most Asset Banks will contain a dropdown list attribute called Active Status. This has the potential values: 'Inactive', 'Active' and 'Expired'. If we only want assets with this attribute set to 'Active' to be visible to users in the current group then we would put a tick next to 'Inactive' and 'Expired'.