The sdelta PPR provides on demand patch generation for source tarballs. For example boxes that are upgrading to from mozilla version 1.7.5 to 1.7.6 can download an upgrade patch instead of a full compressed source tarball.30M for mozilla-1.7.6.tar.bz2 or a meager0.4M for mozilla-source-1.7.5.tar-mozilla-source-1.7.6.tar.sd.bz2Obviously the tiny patches which are generated once and downloaded by many boxes conserve an incredible amount of time, bandwidth, and bottlenecking of the Internet. The client program runs on Linux, FreeBSD, and Solaris of any endian architecture. This collection is constantly being created and is freely accessible.
“sdelta Public Patch Repository,” ibiblio catalog, accessed May 5, 2016, http://www.ibiblio.org/catalog/items/show/4106.