If you type one and the extractor rejects it, try these fixes:
It is a legitimate protection mechanism. However, because AIO Boot contains tools like password crackers and partition managers, Windows Defender might flag the extracted files. You should add an exception to your antivirus folder or run the tools only in an isolated environment (like a test PC).
Once extracted, the files on your hard drive are no longer password-protected. You can freely move, edit, or repack them. To create an unprotected archive, simply select all extracted folders and compress them with 7-Zip without entering a password (or leave the password field blank).