Binary delta compression
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Binary delta conversion or BDC is a technology used in software update deployment.
[edit] Explanation
While downloading large amounts of data over the internet for software-updating means can induce high network traffic problems, especially when a network of computers is involved, BDC technology allows a major reduction of download size by only transferring the difference between the old and the new files during the update process.
[edit] Implementation
In real world implementations, it is common to also use standard compression techniques (such as Lempel-Ziv) while compressing. This makes sense because LZW already works by referring back to re-used strings. ZDelta is a good example of this, as it is built from ZLib. The algorithm works by referring to common patterns not only in the file you are compressing, but also in a "target" file. The benefits of this are that even if there are few similarilties between the original and the new file, you will still get good standard LZW compression.
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