I put this in ../A, and then did: for i in `ls /usr/pkgsrc/licenses`; do wdiff -3 /usr/pkgsrc/licenses/$i ../A > $i; done and then ls -lS, which showed postgresql-license to be closest, and the diff follows. The wording is slightly different, but 'any new file that contains substantial portion of this file' is ordinarily viewed as a copy (or derivative work). So this just barely meets my comfort level for not objecting to you calling it the same. Further, it seems odd that postgresql-license has a -license suffix, since it's obviously intended to be a free license and is OSI approved: http://opensource.org/licenses/PostgreSQL Here's the wdiff output from postgresl-license to what you posted: ====================================================================== [-The PostgreSQL Licence (TPL) Copyright (c) <year>, <organization>-] ====================================================================== [-copies.-] {+copies or in any new file that contains a substantial portion of this file.+} ====================================================================== [-<organization>-] {+THE AUTHOR+} ====================================================================== [-<organization>-] {+THE AUTHOR+} ====================================================================== [-<organization>-] {+THE AUTHOR+} ====================================================================== [-<organization>-] {+THE AUTHOR+} ======================================================================
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