Here is a quick guide:

You may
– download one article per journal issue per session.  Viewing an article on the screen counts as a download, not just saving an electronic copy of the file.  A session is a continuous period of time using the computer, like a login.  You are not limited to one session per day.
– print out a single copy of an article

You may not
– change or delete any copyright information
– systematically download licensed content (i.e. viewing, printing or saving more than one journal article per issue per session)
– display or distribute licensed material (this includes emailing a pdf, for example)
– allow anyone else except authorised users to access the licensed content
– use the licensed content for any commercial purpose (unless you obtain written permission in advance from the publisher)

Further information may be found on the OULS Copyright page.