Proprietary file format (English Wikipedia)

A Quick Introduction to Acrobat Forms Technology (PDF), 2006-05-14, retrieved 2010-02-19, Adobe's XFA Forms is a closed standard that competes with the fully open W3C Xforms standard.

brianlivingston.com

"4.3 Non-HTML file formats". e-Government Unit. May 2002. Archived from the original on February 18, 2010. Retrieved 2010-03-13.

"tutorial: Rich Text Format (RTF)". Colorado State University. Archived from the original on 2012-06-30. Retrieved 2010-03-13.

ISO/TC 171/SC 2/WG 8 N 603 - Meeting Report (PDF), 2011-06-27, XFA is not to be ISO standard just yet. ... The Committee urges Adobe Systems to submit the XFA Specification, XML Forms Architecture (XFA), to ISO for standardization ... The Committee is concerned about the stability of the XFA specification ... Part 2 will reference XFA 3.1

"Gnu PDF - PDF Knowledge - Forms Data Format". Archived from the original on 2013-01-01. Retrieved 2010-02-19. Apparently Adobe introduced something newer called XFA (XML Forms Architecture) which doesn't seem standardized.

"Ubuntu's commitment to only include completely free software by default means that proprietary media formats are not configured 'out of the box'...including DVD, MP3, QuickTime, Windows Media, and more." https://help.ubuntu.com/community/RestrictedFormats. See also "Which proprietary formats should be avoided :: Openformats.org". Archived from the original on 2010-03-28. Retrieved 2010-03-29.

Leonard Rosenthol, Adobe Systems (2012). "PDF and Standards" (PDF). Archived from the original (PDF) on 2013-09-02. Retrieved 2013-10-20.

The RAR Archiver EULA (End user licence agreement) is embedded in installation files - [1] - Quotation: "Neither RAR binary code, WinRAR binary code, UnRAR source or UnRAR binary code may be used or reverse engineered to re-create the RAR compression algorithm, which is proprietary, without written permission of the author."

"Ubuntu's commitment to only include completely free software by default means that proprietary media formats are not configured 'out of the box'...including DVD, MP3, QuickTime, Windows Media, and more." https://help.ubuntu.com/community/RestrictedFormats. See also "Which proprietary formats should be avoided :: Openformats.org". Archived from the original on 2010-03-28. Retrieved 2010-03-29.

"AAC License Fees". Archived from the original on 2010-10-31. Retrieved 2010-10-04.

"AAC License Fees". Archived from the original on 2010-10-31. Retrieved 2010-10-04.
"Ubuntu's commitment to only include completely free software by default means that proprietary media formats are not configured 'out of the box'...including DVD, MP3, QuickTime, Windows Media, and more." https://help.ubuntu.com/community/RestrictedFormats. See also "Which proprietary formats should be avoided :: Openformats.org". Archived from the original on 2010-03-28. Retrieved 2010-03-29.
"tutorial: Rich Text Format (RTF)". Colorado State University. Archived from the original on 2012-06-30. Retrieved 2010-03-13.
"4.3 Non-HTML file formats". e-Government Unit. May 2002. Archived from the original on February 18, 2010. Retrieved 2010-03-13.
"The Novell Antitrust Complaint (as text) & A Law About Antitrust and Standards Writing". 2004-11-17. Archived from the original on 2005-12-30. Retrieved 2010-03-13.
"Gnu PDF - PDF Knowledge - Forms Data Format". Archived from the original on 2013-01-01. Retrieved 2010-02-19. Apparently Adobe introduced something newer called XFA (XML Forms Architecture) which doesn't seem standardized.
Leonard Rosenthol, Adobe Systems (2012). "PDF and Standards" (PDF). Archived from the original (PDF) on 2013-09-02. Retrieved 2013-10-20.