Extract text from visuals. You can also read this article in German, Spanish, French, Indonesian, Italian and Portuguese. It is possible to lock them The most likely answer is that the text in the PDF document does not contain the right characters. Unless you have the exact font or facing that the user used (assuming that you can select the text like you say), you will not be able to grab the symbols correctlyAnswers. You can read these reasons in more detail belowOpen Password Protection. Sort