/usr/share/themes/Curve/xfwm4/README is in xfwm4-themes 4.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | Curve
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Ported from Metacity theme "Bluecurve" by Garrett LeSage and Havoc Pennington
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