Unable to fill and sign documents on ipad

[Mikuláš5C74]

Hello, I need to fill and sign some pdf documents. On Computer (windows) it works just fine, but when i try it on my ipad with the very same document, it says “this tool is not available because the document is password protected”. What can I do? Thank you for your help.

[Tom5F84]

I did not inquire any requested information. This Tom5f84 is not me and
sounds like an attempt of identity theft. Be aware!!!