Over time, the open source OOo code base would become ghettoized and gradually fall further behind the proprietary versions.

In additional to these "standardized" GDS, some airlines have proprietary versions which they use to run their flight operations.

The proprietary version of TwinVQ can be also used for speech encoding.

It sold proprietary versions to big corporations for years and eventually sold the related IP.

Aegis was written in a proprietary version of Pascal.

They weren't "contributed" in a last-ditch effort to save face after unsuccessful attempts to monetise a proprietary version.

The 8x8x3 geometry is a popular one with 3D chess inventors, and several proprietary versions exist.

Yeah, I was thinking the same thing, that it's more of a souped-up proprietary version of epub, pretty much turning it into another html format.

The Russian company Etersoft has been developing a proprietary version of Wine since 2006.

There are also proprietary versions such as SuperWYlbur.