I'll share some info about QuickBooks password protection, jaapkrijger. 

To ensure the protection of your critical data, QuickBooks Desktop requires passwords to protect data files. Passwords required must be changed every 90 days. QuickBooks prompts you to change your password near the end of the 90 days as well as on the expiration date itself. 

To learn more about Password security, check out this article: Password security for QuickBooks Desktop. 

Otherwise, you can visit our Data and security page for more insights about managing your Intuit account, log in, password, profile, security, and data.   

Thank you for reaching out to us here, and please let me know if there's anything else I can do to help.