Audiobook & Web Publication: Some LPF files are deployed as a zipped Readium Audiobook Format. Visit Readium for details.
Try create LPF file with other voice, rename to zip, unzip. If fail, try find out file format (different archive tool, magic byte header, gnu string tool, hexdump).
If zip, inspect unzipped, look for signature or similar (some zip have comment in metadata). If signature, probably need certificate from elevenlabs/google, not easy. Probably easier mislabel as human speaker and submit. Check legal consequence if worth for you.
https://filext.com/file-extension/LPF (https://archive.is/gvXmD)
Try create LPF file with other voice, rename to zip, unzip. If fail, try find out file format (different archive tool, magic byte header, gnu string tool, hexdump).
If zip, inspect unzipped, look for signature or similar (some zip have comment in metadata). If signature, probably need certificate from elevenlabs/google, not easy. Probably easier mislabel as human speaker and submit. Check legal consequence if worth for you.
If no signature, inspect unzipped, maybe use readium software (https://github.com/readium/awesome-readium), maybe readium drm (https://github.com/readium/readium-lcp-server, https://github.com/readium/lcp-specs https://github.com/readium/r2-lcp-swift https://github.com/readium/readium-lcp-client). From there see if/how can fake content. Zip again, submit. Trial and error, maybe work maybe not.