I am wondering about the scripting and such capabilities within epub and mobi files. I see that there are free programs to open them such as Calibre or in a web browser. Is it similar to a pdf, where it is mainly dependent on the program and system opening the file? Is it safer to use a program like Calibre rather than a browser? Besides intended scripting abilities, would errors in programs like Calibre allow for code execution (within reason, I realize this is probably a potential problem for any program or file)?

I realize you can never really be 100% sure, but I feel safe opening pdfs in Preview because supposedly the scripting capabilities are not there. Is there a similar line to follow with epubs or mobi or are they completely innocuous?

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