OpenCV/opencv_contrib/modules/surface_matching/PATENTS.txt

The following patents have been issued for methods embodied in this
software: "Recognition and pose determination of 3D objects in 3D scenes
using geometric point pair descriptors and the generalized Hough
Transform", Bertram Heinrich Drost, Markus Ulrich, EP Patent 2385483
(Nov. 21, 2012), assignee: MVTec Software GmbH, 81675 Muenchen
(Germany); "Recognition and pose determination of 3D objects in 3D
scenes", Bertram Heinrich Drost, Markus Ulrich, US Patent 8830229 (Sept.
9, 2014), assignee: MVTec Software GmbH, 81675 Muenchen (Germany).
Further patents are pending. For further details, contact MVTec Software
GmbH (info@mvtec.com).

Note that restrictions imposed by these patents (and possibly others)
exist independently of and may be in conflict with the freedoms granted
in OpenCV license, which refers to copyright of the program, not patents
for any methods that it implements. Both copyright and patent law must
be obeyed to legally use and redistribute this program and it is not the
purpose of this license to induce you to infringe any patents or other
property right claims or to contest validity of any such claims.  If you
redistribute or use the program, then this license merely protects you
from committing copyright infringement.  It does not protect you from
committing patent infringement.  So, before you do anything with this
program, make sure that you have permission to do so not merely in terms
of copyright, but also in terms of patent law.

Please note that this license is not to be understood as a guarantee
either.  If you use the program according to this license, but in
conflict with patent law, it does not mean that the licensor will refund
you for any losses that you incur if you are sued for your patent
infringement.