Quote:
Originally Posted by kovidgoyal
And I'm saying that the standard is being idiotic. It's not possible to have a unique ID for every ebook file ever created.
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Yes, it is. Use a standard cryptographic hash function, for example MD5 or SHA1 (available e.g. in openssl) and it will generate a hex string like 341e5d61ce55df379493267c1926796b1d1fcbb9 uniquely identifying your file content. Unique not only for every ebook file, for every file ever created.