The Permissions tab of the Procedure property sheet has the following components:
Users list Lists the users who have permissions on the procedure. If you want to add users to the list, click Grant. To remove permissions from a user, select the user and then click Revoke. You can select multiple users by holding Shift while you click.
Click the Execute field beside each user to grant or revoke permissions.
Grant Displays the Grant Permission dialog, which lets you grant permissions for the procedure to other users or groups.
Revoke Revokes permissions for the procedure from the user or group and removes them from the Users list.