I see this old thread about Decklink licensing, and I disagree with the nonfree
requirement.
I can’t figure out how to reply to the old thread, but here it is for
reference: https://patchwork.ffmpeg.org/patch/3230/
<https://patchwork.ffmpeg.org/patch/3230/>
Downloading the SDK from Blackmagic uses a EULA which prevents distribution,
but each individual header file contains a more permissive Boost license. So
apparently, the only part of the SDK covered by the restrictive EULA is the PDF
documentation. This means the headers could even be included in the ffmpeg
GitHub if you desire.
I emailed Blackmagic to clarify this, and here is their response:
There is no fee to use the DeckLink SDK. Access to the DeckLink SDK is governed
by the EULA and is only available from the Blackmagic Design website.
Applications that are built with the SDK are then licensed via the more
permissive license contained within the SDK.
It is Blackmagic Design policy that there should only be one publicly available
source for the SDK (i.e. the Blackmagic Design website) and in order to
download the SDK the EULA must be agreed to.
In addition, distribution of the SDK is prohibited as per the EULA ("The
Licensee must not lease, rent, distribute or sub-license the Software, or use
the Software in a time-sharing arrangement, or in any other manner that is not
the Permitted Use.”)
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