This a clone of official libdc1394 repo that adds support for FLIR cameras.
The patch itself is in file libdc1394-2.1.2-flir.patch. Unfortunately, original supplement documentation is gone. IIDC specs says that camera should store several predefined values in some registers. Libdc1394 reads the values from these registers and based on the results decides whether it can handle the camera.
The patch adds a value that is stored in registers of FLIR camera. It also adds appropriate checks for this value.
The license complies with that of original libdc1394 library. The 1394-Based Digital Camera Control Library is licensed under the Lesser General Public License (short LGPL, see file COPYING in the source distribution). Other files in the source archives not belonging to but being part of the build procedure of libraw1394 are under their own licenses, as stated at the top of the individual files.
Those of you who read Russian - please refer to general overview of the patch.