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--- pdftk_notes [2022/06/23 04:06] – [store a pdf without password] raju
+++ pdftk_notes [2022/07/21 02:45] – [store a pdf without password] raju
@@ Line 25: / Line 25: @@
 Ref:- https://www.cyberciti.biz/faq/removing-password-from-pdf-on-linux/ - Mentions qpdf; gives more alternatives.
+==== encrypt a pdf with password ====
+<code>
+pdftk in.pdf output out.pdf user_pw foo
+</code>
+Ref:- http://askubuntu.com/questions/258848/is-there-a-tool-that-can-add-a-password-to-a-pdf-file
+Note:- I was unable to encrypt a pdf file using Adobe Reader X1 Version 11.0.13 . I could not find the "Tools pane" described in <nowiki>http://www.adobe.com/content/dam/Adobe/en/products/acrobat/pdfs/adobe-acrobat-xi-protect-pdf-file-with-permissions-tutorial-ue.pdf</nowiki>. I also tried File -> Properties -> Security after opening the file. However all the options in that window are greyed out. So I can't add a password from there as well. I was told that Adobe Standard can do this but it costs money whereas pdftk is free. In the end, using pdftk was a no brainer.
 ==== make two copies of the same document ====