[Poppler-bugs] [Bug 103547] New: License is unclear

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103547

            Bug ID: 103547
           Summary: License is unclear
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: r.hieber at pengutronix.de

I'm unsure which open source license applies to poppler. The README specifies
GPL without a version:

        Please note that xpdf, and thus poppler, is licensed under the GPL,
        not the LGPL.  Consequently, any application using poppler must also
        be licensed under the GPL.

Additionally, README-XPDF specifies GPL v2 or GPL v3, but:

        Please note that Xpdf is NOT licensed under "any later version" of the
        GPL, as I have no idea what those versions will look like.

However, most of the files in the poppler/ folder contain "GPL v2 or later"
file headers, for example poppler/Annot.cc:

        // All changes made under the Poppler project to this file are licensed
        // under GPL version 2 or later

So it is clearly some variation of the GPL, but which one?

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