Security with SharePoint can occur at multiple levels. There is controlling access to the entire site itself, to individual folders within the site, or to individual report items. At all three levels, security is performed similarly, you'll select the Share option, then indicate the Active Directory user or group to share with.
Most of the time, you'll be sharing with Active Directory groups, but for simplicity in this chapter's examples we'll use a user name. To keep things simple just remember when we say user in this section, we mean user or group. The technique is identical for both.
With security there are multiple actions to perform, such as adding, altering, and removing permissions for a user. Hence we've broken this up into mini-recipes for each action to make it easier to find what you need to do.