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+xdelta - Binary delta generator
+
+Xdelta is a program designed to compute changes between files. These changes
+(deltas) are similar to the output of the "diff" program in that they may be
+used to store and transmit only the changes between files. However, unlike
+diff(1), the output of xdelta is not expressed in a human-readable format.
+
+Xdelta uses a fast, linear algorithm and performs well on both binary and
+text files.