Default sch-rnd symbol licensing policy
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Symbol files normally should contain three attributes:

 - sym-copyright: free form text with the copyright holder's name
                  and year of the copyright

 - sym-license-dist: generic symbol file distribution license

 - sym-license-use: distribution license in the special case the symbol
                    is used in a schematics sheet and distributed in/with
                    the schematics sheet for the specific purpose of
                    making the schematic sheet work

In practice this means if you use a symbol by placing it in a schematics,
and distribute the schematics with all the symbols it uses, sym-license-use
applies. However if you are distributing a library of symbols for other,
purposes, for example with the intention of providing a generic, reusable
set of symbols, sym-license-dist applies.

If sym-license-dist or sym-license-use contains the text "Public Domain"
(with or without capital letters), the user of the file may alternatively
choose the apply the Creative Commons CC0 license (CC0 1.0 Universal) instead
for distribution or use, respectively.

Sch-rnd symbol files having any of these three fields are assumed to
interpret them as described above unless accompanying document explicitly
states otherwise.
