How to unprotect pdf document

i took on bunch of documents our file servers. need update contents.

those pdf files created years ago , password protected.

no 1 know password unlock these pdf files.

 

how unlock password in protected pdf files?

 

thank help.

hi ,

 

refer following link same .

securing pdfs passwords, adobe acrobat

 

however need acrobat perform function,reader not let this.

 

regards

sukrit dhingra

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