Although in some cases it is recommended to protect the PDF file with a password, you can forget what the password is by disabling access to your own file.
Ọ bụ ezie na ịchebe faịlụ PDF na paswọọdụ akwadoro n'ọnọdụ ụfọdụ, ị nwere ike ịghara ichefu ihe paswọọdụ bụ, ịhapụ ohere ịnweta faịlụ gị.