(ddd.info)Free Software

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Free software
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DDD is "free"; this means that everyone is free to use it and free to
redistribute it on a free basis.  DDD is not in the public domain; it
is copyrighted and there are restrictions on its distribution, but
these restrictions are designed to permit everything that a good
cooperating citizen would want to do.  What is not allowed is to try to
prevent others from further sharing any version of DDD that they might
get from you.  The precise conditions are found in the GNU General
Public License that comes with DDD; Note: License, for details.

   The easiest way to get a copy of DDD is from someone else who has
it.  You need not ask for permission to do so, or tell any one else;
just copy it.