From the CLA Code of Ethics, 1976:
Members of the Canadian Library Association have the individual and collective responsibility to...
3. facilitate access to any or all sources of information which may be of assistance to library users.
While open access to information online would not have been contemplated back in 1976, it is hard to see how this could be interpreted as anything other than a very strong endorsement of the philosophy of full and complete open access; not access to what we can afford, or access to back issues, etc., but rather an ethical obligation to facilitate access to "any or all sources of information".
This blogpost is part of the Canadian Leadership in the Open Access Movement series.