For in-copyright works (assuming they can figure out which these are),
the amount displayed will be extremely limited (a kind of 'keyhole'
view) though, of course, as far as legality is concerned that is hardly
the point.
On the contrary, I think that "substantiality" of the copying is deeply
relevant to the legality question -- or at least to the Fair Use/Fair
Dealing question. The law includes explicit allowances for the copying
and redistribution of small portions of copyrighted texts, within certain
limits.
----
Rick Anderson
Dir. of Resource Acquisition
University of Nevada, Reno Libraries
(775) 784-6500 x273
rickand@unr.edu