DM> Mort rest assured he has no clue of what is involved in the duration 
DM> and 
DM> renewal of copyright. I can envision matt as one of the school 
DM> administration types you described in one of your past postings. What 
DM> is 
DM> the probability of a text (such as a math/physics text) being 
DM> suitable for 
DM> use when and if it ever goes out of copyright?
    Surprisingly high for a math text.  2+2 still equals 4, and always will.
    Algebra as taught at the HS level hasn't changed much since my father 
took it, and probably won't.  (Analytic geometry and quadratic equations will 
be the same 50 years from now.)  
    There is no shortage of out-of-copyright books.  While few HS history 
texts will still be relevant once their copyrights lapse, many math and 
physics books at the HS level will still be relevant.
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