Add a little verbiage about login ids and shared accounts.

www/security.html

@@ -14,6 +14,14 @@ Here is a brief rundown of some important security issues you should
 be aware of. 
 </p>
 
+<h3>Login IDs</h3>
+
+<p>
+We require all Emulab users to provide current, non-pseudonymic login
+IDs. Shared accounts are strictly forbidden! Each user should apply
+separately and specify their standard login name.
+</p>
+
 <h3>Cookies</h3>
 
 <p>
@@ -79,6 +87,7 @@ which we will pass on to you at no extra charge:
 <p>
 We require all Emulab users to provide current, non-pseudonymic email
 addresses. Redirections and anonymous email addresses are not allowed.
+We do not sell or give your email addresses away! 
 </p>
 
 <h3>Passwords</h3>