With no disrespect to you and with great sorrow that it seems we are evading your issue, there is no way across the web for us to determine the real owner of the data or application.
We are all volunteers here and are donating our time. That makes us individual contributors, which is the way the site owner needs it to be to avoid liability for our actions. If we were to give you information that would allow you to break in to a database and IF you were lying to us about being the owner, we would open ourselves up to charges of aiding in theft of computer software or services. Not only do we not need that as individuals, but to have a forum member charged with theft of software would deeply tarnish - if not completely destroy - our reputation as a good site to help with problems. In essence, you have asked the unanswerable question.
I might be wrong, but even if someone here wanted to help I do not think they could technically (even if you forget the morally and legally). AFAIK you would need a third party tool and as @isladogs pointed out most do not work on ACCDE/ACCDB. If you read the fine print on most of them work with MDBs and 2007 prior. There are some trial versions out there.
Password verification methods used in MS Access 2010 - 2019 are based on industry strong encryption and hashing algorithms (SHA-1, SHA-512, AES) and instant password recovery or decryption cannot be guaranteed in contrast to prior MS Access versions. Moreover recovery speed is limited due to iterative methods used in password verification.
To reiterate, the only way you can prove you are the real owner is if you have purchased the software from a legitimate company and have the licence documentation. If the application was developed in-house, it is impossible to verify ownership.
For info, there is a company called EverythingAccess that provides a unique service recovering ACCDB files from ACCDE (at a price). However they will only do so if you can prove ownership ... for which the above conditions apply.
As a professional developer, I would be very unhappy if you somehow acquired licence info or passwords for any of my commercial applications without purchasing them. You cannot expect any of us to assist you hacking into a database that you cannot prove ownership of.
I'm sorry but nobody at this site will provide you with the information you are asking us to provide
Your best solution is to obtain it from the original developer - if you have purchased it, that shouldn't be a problem.