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And the questions are tough . It is clear that the only way to ensure that computers and consumer home products are accessible to blind people is to require by mandate that the designers and developers of these products include provisions for such accessibility in their original designs . Some recommended books are available at your local library , although I have made a point of mentioning some references that are less well known , such as unpublished dissertations and manuscripts . By contrast , restrictions on parallel imports extend intellectual property into the sphere of distribution . Many of these books are available in the reference collection and in the circulating collection . As a result , we cannot claim in any rigorous sense that our findings and policy implications are applicable to all grantees .