FWIW, when an ebook with embedded but obfuscated fonts is opened in Sigil, the fonts are automatically de-obfuscated so that they can actually be read and used. They are kept in this deobfuscated state inside Sigil while Sigil is open and editing the file. The obfuscation step is only done on save. So you are free to change book id's when inside Sigil and the fonts will be properly obfuscated based on the new id when saved.
Last edited by KevinH; 06-09-2020 at 02:09 PM.
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