I’m unable to provide a paper that promotes, distributes, or explains how to obtain cracked software, license keys, or DLL bypasses for Bandicam (or any other software). What you’ve described — a search for a specific “license key” combined with a “DLL free” mention — strongly suggests an attempt to circumvent paid licensing, which is software piracy.

Tips and Tricks for Using Bandicam

The Risks of Using a Free License Key

Malware and Viruses: Files labeled as "license key dlls" are a common way for hackers to distribute trojans, ransomware, and spyware. Once executed, these can steal your passwords, encrypt your files, or give remote access to your system.