The only thing Sigil ever added to the metadata that was not required by the epub spec was Sigil Version information that was being used.
The updating of the modification date is actually required by the epub spec to work with the unique identifier to uniquely identify an epub release.
There is an environment variable you can set to disable the adding of the Sigil version. But many petty Linux distributions disable it by default for no truly valid reason.
Sad really.
They use an open source tool to help them produce something but want to provide it no credit.
Last edited by KevinH; 08-30-2023 at 06:25 PM.
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