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KevinH · 07-17-2025, 11:43 AM

Not unless the custom metadata is not structured properly, uses unknown namespaces, or unknown tags. The only piece of metadata that is shielded in the MetaData Editor is the bookid dc:identifier as changes to that element have ramifications for font obfuscation, ncx, and Checkpoints, etc. So user changes to that value are not shown or allowed in the Metadata Editor.

Did you open the OPF tab in CodeView to see it is still present in the metadata tag in the OPF?

What version of Sigil are you using?

Also was this epub2 or epub3?

Please show the exact custom metadata you tried to insert in this thread and I may be able to tell you more, and check to see if it is a bug.

07-17-2025, 11:43 AM	#2
KevinH Sigil Developer Posts: 8,848 Karma: 6120478 Join Date: Nov 2009 Device: many	Not unless the custom metadata is not structured properly, uses unknown namespaces, or unknown tags. The only piece of metadata that is shielded in the MetaData Editor is the bookid dc:identifier as changes to that element have ramifications for font obfuscation, ncx, and Checkpoints, etc. So user changes to that value are not shown or allowed in the Metadata Editor. Did you open the OPF tab in CodeView to see it is still present in the metadata tag in the OPF? What version of Sigil are you using? Also was this epub2 or epub3? Please show the exact custom metadata you tried to insert in this thread and I may be able to tell you more, and check to see if it is a bug. Last edited by KevinH; 07-17-2025 at 12:53 PM.