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Hi @Muka65 

To create new to open your PDFs you need to follow the same steps as to create a password to an unprotected PDF, because protection cannot be removed on the mobile reader app. 

However, you can remove protection from the Acrobat DC desktop app and create a new password. 

you can refer to the article below to remove protection:

https://www.adobe.com/acrobat/how-to/unlock-pdf.html

Let us know if that helps.

Thanks,

Harsh