At the end of section 7 of gpl v3:7. Additional Terms  ....  Additional terms, permissive or non-permissive, may be stated in the form of a separately written license, or stated as exceptions; the above requirements apply either way.In the top of the licence:Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.so: How should I understand may be stated in the form of a separately written license, or stated as exceptions? {[the form of a separately written license,] OR [stated as exceptions]} ? - so, stated as exceptions means NOT the form of a separately written license and so as exceptions in same licence file by modifying it? but additional terms MUST be only in separate file due to the changing it is not allowed?or, changing it is not allowed does not mean changing file and allow putting licence in one file with other additional text? In that case or stated as exceptions means that the exceptions can be put in same text file with gplv3 licence itself's text, after it or before it?
gpl3 or stated as exceptions
licensing;gpl