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UltraISO

A screenshot of UltraISO
Developer(s)	EZB Systems
Initial release	April 20, 2002
Stable release	9.76.3860 / 8 July 2023; 20 months ago (2023-07-08)[1]
Operating system	Microsoft Windows
Platform	IA-32 andx86-64
Type	Optical disc authoring software andvirtual drive
License	Commercial
Website	www.ezbsystems.com/ultraiso/

UltraISO is acrippleware application forMicrosoft Windows for creating, modifying and convertingISO image files used foroptical disc authoring, currently being produced by EZB Systems.

Initially UltraISO wasshareware however since 2006 it has turned intocommercial software.^[2] The 'Free Trial' version is limited to ISO images of 300 MB or less, effectively making itCrippleware.^[3]

UltraISO uses a proprietary format known as ISZ. The format is advertised as "ISO Zipped", even though it is not a simple zip archive. The format useszlib orbzip2 to compress the data, and may useAES-128,192 or 256 encryption in theCBC mode^[4] (note that this provides no integrity protection and is vulnerable to thepadding oracle attack^[5]). The file format specification is available publicly on EZB Systems's website.^[4] The format is now supported by third-party applications such asDaemon Tools,Alcohol 120% andCDemu.

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