Krn, Krnconvert and Kdecode are released under the GPL, Read the COPYING file if you want the specifics.
If you believe there is something that restricts you from redistributing KRN, just ask me: Roberto Alsina <ralsina@unl.edu.ar> and I'll clear it for you.
For instance, if you want to distribute KRN under another license, just ask, and you may even get it.
Krnsubsql (which is just a rename of Gigabase's subsql), its sources and all source files in the gigabase directory are property of Konstantin Knizhnik and are under this license:
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR OF THIS SOFTWARE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Please don't bother Konstantin with any problems you may have with krn or krnsubsql, bother ME.
Roberto Alsina
ralsina@unl.edu.ar
Enjoy!