Wikipedia
DoPDF
doPDF is a Portable Document Format (PDF) printer developed by Softland, that allows any program that can print to create a PDF file. The resolution of the created PDF files can be set manually or done automatically. doPDF is freeware which displays advertisements.
doPDF is simplified version of Softland's commercial NovaPDF, which offers additional features, including Advanced Encryption Standard, password protection, digital signing, URL links support, text/images watermark, the ability to choose PDF version, etc.