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Thank you all so very much for helping me. I'm learning a lot. Here's an update of what I've done so far:
Removing the embedded fonts on each input file worked in the sense of getting a valid anthology but the output is not acceptable for readability. Those font changes like italics, etc. are necessary.
I have not used InDesign and the users I know do not know how or if the encryption of embedded fonts can be modified.
I then tried various combinations of versions on a desktop running Windows 10 and obtained the following results, always using only the files I put in the folder in the link I posted earlier:
Calibre v7.16 EpubMerge v3.1 Failed
Calibre v7.16 EpubMerge v2.17 Failed
Calibre v7.6 EpubMerge v3.1 Failed
Calibre v7.6 EpubMerge v2.17 SUCCESS!
So in my role as a volunteer IT support for a small non-profit office, I can keep them working by installing C v7.6 EM v2.17 on their desktops and telling them not to upgrade either one until I tell them it's ok.
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