Document the Patent

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SIFT is patent protected and naming this library "Open" may mislead people into believing that it is "free as in beer".

http://en.wikipedia.org/wiki/Scale-invariant_feature_transform

Please document this on your homepage... your code may be open source but anyone wanting to actually use it in the US needs to seek a commercial arrangement with UBC.

In the UK, it is not possible to patent an algorithm (although it is possible to patent one for a particular application, just not the mathematics of it).

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duh! I just realised you've documented it quite clearly in the LICENSE file. I guess I was expecting to see this in the README as well.