No, it is not a privacy concern. All remover apps that remove passwords from PDFs are usually very safe, and most have software that helps protect the documents from malware and piracy and helps keep the important ones safe and protected. Any tools listed above in the article may be used to decode the PDF document. What most of these apps do is pretty simple. They only remove the encrypted password-protected portion, leaving the file free to be now edited without requiring a password from the user who is using the password remover.