I have now found a way to detect the broken encryption.xml font uris and fix them to prevent Sigil from hanging on load. This fix has been committed to master.
It will appear in the next release of Sigil.
So thank you for your bug report!
Kevin
ps: If you want to fix this in your epub, unzip it and hand edit the META-INF/encryption.xml file with a decent text editor and for each font URI that begins with "../" remove the "../" and save the file. Then rezip and it, rename it to epub and then load it in Sigil.
ps. Even with all of its bugs and issues, it appears to "work".
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