Password requiring 6 characters
Requiring 6 characters on a password is unnecessary and hurts the user-friendly nature of the program. This decision is asinine.
Mohd Kashif commented
In the latest version of Acrobat, Adobe made character limit for passwords consistent across all UI invocation points. Protect tool already had a limit of 6 characters but some entry points still allowed lower limits which was raised by some customers as an anomaly. In latest version minimum limit has been set to 6 for all invocation points.