Security groups are used to protect sessions from a subset of system users. Assign your entry to a security group to then control who has access to it and how much control they have on the entry.
Click on the arrow of the Security group box to select one of your existing security group. If you have assigned a security group to your parent folder it will be automatically inherited by all entries created under that folder, it is why, like in our example below, even if you have your security group at None your entry will still have a security group applied to it which would be the Client Group Security Group.
Entry - Security side menu
Remote Desktop Manager's security groups are container for sessions, not for users. Folders are closely tied with Security Groups, so there's an overlap in usage. The key points are:
•Security is inherited: child items and folders are covered by a parent folder's security group.
•Security is additive: a security group added to a sub folder does not override the parent, it adds to it.
•A folder has a single Security Group: use Shortcuts to work around that limitation.
Fore more information see Security Group Management.
The Permissions allows you to assign particular permission to groups or single user. To learn more please see Permissions.
Entry - Security Permissinos