[ros-dev] GPLv3 Migration - flamewar warning

[CK Raju]

> Thus an author who picks up parts of code from a
> GPL3 source and mixes it any other version has to
> necessarily release the resultant code in GPL3.

The exception in the compatibility matrix is that one
cannot combine codes from *GPLv2 only* and have it
released in GPL3; nor obtain code released under GPL3
for modifying *GPLv2 only* code.

In both these cases, whenever the requirement of
mixing becomes imminent, the original authors (single
or multiple) who have released their code in *GPLv2
only* has/have to upgrade the license to either *GPLv2
or later* or to *GPL3*.

CK Raju

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