The version you mentioned, Imtoo Video Converter Ultimate v7.8.17 Build 20160613, suggests a fairly older version of the software. Newer versions typically bring improvements, additional features, bug fixes, and support for the latest video and audio formats.
ImTOO Software Studio is a legitimate developer. Using a serial key without purchasing a license is software piracy. While the likelihood of legal action for a single user is low, it undermines the developers who created the tools. imtoo video converter ultimate v7817 build 20160613 serial
The software supports a vast array of formats, categorized as follows: The version you mentioned, Imtoo Video Converter Ultimate v7
For users looking for powerful video conversion tools, there are several alternatives to Imtoo Video Converter Ultimate: The version you mentioned