How to Unlock Password Protected or Encrypted Adobe PDF Files

Technically there are two types of encryption methods to protect or restrict PDF files – Password to open (user password) or password to restrict printing and editing (owner password). “Password to open” (user password) will restrict opening of PDF file while “password to restrict printing and editing” (owner password) will only restriction the feature such as prevent print, copy or convert the contents of text, modify, edit, etc, on PDF file, depending on owner preferences on document properties.
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