qpdf --qdf input.pdf output.pdf acroread output.pdf # unlock, print-to-file output.ps ps2pdf output.ps # output.pdf is now unlocked
acroread output.pdf # unlock, print-to-file output.ps sed "/mark currentfile eexec/,/cleartomark/ d" output.ps | \ ps2pdf - output.pdf
pdfcrack -n 9 input.pdf
GoogleDrive will unlock PDF files, there is a size limit of 2MB.
Ghostscripts GSView: rename file from PDF to PS and try to open it, then save the file back to PDF.
To put txt into pdf the util called text2pdf worked found at: http://www.eprg.org/pdfcorner/text2pdf/ To join pdf's together use pdfunite
pdfunite in-1.pdf in-2.pdf in-3.pdf OUT.pdf