AES means Advanced Encryption Standard.
PDF encrypted with AES method, will open supports Adobe Reader 6.0(or Acrobat 6.0) and upper, but also more safer.
and there are also a bad news, pdfcrack supports crack PDF with AES encryption. and there exists win32 version.

Here I collect some useful applications have source code that can help you easily convert Tiff or Fax to PDF, some support windows, some support linux, some support both.

• Convert Tiff To Pdf:Tiff To PDF conversion Source Code.
• Scan2PDF:A utility for bulk scanning, converting the scanned pages to PDF and burning them on CD/DVD for archiving.
• Fax G3 TIFF to PDF converter

:fax2pdf provides a means to convert sets of G3 fax pages (encoded in a TIFF variant) into PDF. This can be used to convert fax pages received with eg. HylaFAX into a file format readily accessible/viewable with programs on most platforms.

• tiff2pdf, a part of gnuwin32 tiff, if you want to use it, you need both download:

tiff-3.8.2-1-bin.zip
and
tiff-3.8.2-1-dep.zip
or go to download the last version by yourself

• and there are some useful examples for Converting tiff files to PDF in iText(Java Version) and iTextSharp(C# version)

Tiff2Pdf.java: for detail
Tiff2Pdf.cs

Update:

1. If you have know the password, and want to remove the password, please use this free software,PdfCrypt
2. pdfcrack 0.11 for Window Releases

Some body compiled a windows version pdfcrack by using Cygwin, it needs cygwin1.dll, but he does not offer, I download it and add cygwin1.dll, so you can directly use it after download.
I have test it, and it supports 128-bit AES encryption(PDF1.6, Acrobat 7.0).
download:
http://www.rubypdf.com/wp-download/pdfcrack-0.8-win32.zip
screeshoot:

reference:
http://sourceforge.net/forum/forum.php?thread_id=1531079&forum_id=575586
PDFCrack – A Password Recovery Tool for PDF-files
http://pdfcrack.sourceforge.net/

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