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Thank you in advance for your patience and understanding on the matter.
That's probably a proprietary piece of software. There are logs of Cookie message plugins available for all the commonly used systems like Joomla, Wordpress etc. for free. Simply search the Internet for them.
Proprietary software is software that is owned by someone and was specificially developed for that one rights holder, in this case, the software is part of Plesk, hence the Plesk company is the rights owner to that software. There is no script that you can take, modify or re-use, it is simply something that was built into the Plesk panel software. So from the user's perspective there is no such thing like "the script of the Cookie opt-in".
While there are individual parts of many commercial operating systems and platforms that are covered by open source licenses (many Linux distributions), Obsidian is indeed a proprietary product.