On 2020-10-13 at 15:01:51 -0600, Karl Berry wrote:

 >     rather than any technical restriction: pdfTeX is GPL.
 >
 > FWIW, I suspect Thanh would not have a problem with allowing use of
 > those primitive implementations under CC0 or any other license terms.

AFAIK it's under GPL because it contains libraries from xpdf and maybe
a few others which were already under GPL.

Regards,
  Reinhard

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