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.
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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.