Password remover in multiple file

[Fatima5E49]

I am using adobe acrobat DC. How can I remove paswword in multiple files at a time ?

[try67]

- Do you have Acrobat DC Pro?

- Do all the files have the same password?

- Do you know that password?

[Fatima5E49]

- No, I have adobe acrobat 5.0

- Yes All files have same password

- Yes I know the password  

[try67]

It's not possible in that ancient version of Acrobat, as far as I know.