DFSG-compatibility of a overly short license [tensorflow dependency]

[Lumin <cdluminate@gmail.com>]

Hi debian-legal,

The license for the last libtensorflow.so dependency is very confusing
because it looks quite incomplete, or exetremely overly simplified.

> https://github.com/tensorflow/tensorflow/blob/master/third_party/fft2d/LICENSE
> 
> Copyright(C) 1997,2001 Takuya OOURA (email: ooura@kurims.kyoto-u.ac.jp).
> You may use, copy, modify this code for any purpose and
> without fee. You may distribute this ORIGINAL package.

Is this a free software license? Is it DFSG-compatible?
It doesn't tell me any detail and looks incomplete.

Thanks in advance.