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Thank you for posting on Adobe forums.
Once you choose 'No security' option, the password is removed from the document.
Please share the screenshot of the window that prompts you to enter password.
Let me know.
A PDF document may have two passwords
1. "Open password" is needed to open the file and view it. Security restrictions may apply.
2. "Permissions password" is needed to remove or change security.
This is necessary, otherwise the security options on a password protected file (with open password) could be removed by anyone.
kathrynsilvaconway: You probably have only open password. You need , as TSN stated, to have the permissions password in order to remove or change security.