I was just wondering if PDF formats are opensource.
I've seen openoffice save a document in ODT format in contrast to DOC or DOCX. Is there alternate file format to PDF?
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This question appears to be off-topic. The users who voted to close gave this specific reason:
The PDF format itself is freely usable and the relevant patents can be used freely (although they apparently remain under Adobe's control so this could potentially change, IANAL regarding patent law).
The ODT format is part of the OpenDocument specifications, which are also free to use, see http://en.wikipedia.org/wiki/OpenDocument#Licensing.
However, if you are looking for the advanced features of PDF files such as fillable forms, security signatures, and such you will not find those features in PostScript files.
The Linux/UNIX world has long had useful tools for working with PostScript files such as GhostScript, which also happens to work with PDF files.