Quote:
Originally Posted by Kali Yuga
Sort of. The MOBI format is open (and in common use), Topaz is not.
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The Mobi format certainly is not "open". It's proprietary to Amazon, and the file format is not officially documented. The ePub file format, on the other file, is both an open standard, and is fully documented.
Of course, the DRM "extensions" to ePub are proprietary and undocumented.