Sd and Sdtty are "free" programs. In short, this means that it is perfectly legal and ethical to copy and redistribute the program and documentation. For example, you may obtain the program by having a friend copy the disk and manual for you. (Or just copy the disk and print your own manual from the file that is on the disk.)
Sd and Sdtty are sometimes also distributed in source form. When so distributed, they are licensed under the GNU General Public License, which is in the file `COPYING'. The terms of this license, for distribution of source files or programs made from modified source files, are very strict. Programs constructed from modified source files may never be duplicated or redistributed by anyone, even in executable form, without obeying the conditions of the license. Read the license carefully.
Note in particular that any modified program based on Sd or Sdtty must obey the licensing terms every time it is redistributed by anyone. This requires redistribution of all of the source files, or otherwise complying with section 3 of the license.
The installation program `install.exe' contains licensed commercial decompression software. The licensing terms prohibit extracting or reverse-engineering that software.
This document is distributed in both formatted and plain-text form, in the files `sd_doc.ps' and `sd_doc.txt', respectively. Some other documents are also distributed with the program. Permission is given to distribute verbatim copies of these documents, either by photocopier or by computer, but modification of them is forbidden by copyright law.
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