Unfortunately, as my colleagues who teach will tell you, the journals that  
charge for document access are serious about copyright infringement.   All 
instructors now have to jump a variety of hoops to legally use documents -  
other than a short extract from a published work.
 
The internet brings new challenges and issues.  If I give Allen a copy  of 
a paper, who's to know?  And, the journal is not going to expend much  
effort trying to find these violations.  Post a PDF of a published paper,  even 
one of your own, on your own website, and you've just opened up a  potential 
distribution to thousands or even millions.  That's a  completely different 
scenario - one that the journals are watching.
 
I don't have a solution.  Jerry

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