High Quality Content by WIKIPEDIA articles! UPX, the Ultimate Packer for eXecutables, is a free and open source executable packer supporting a number of file formats from different operating systems. UPX uses a compression algorithm called UCL, which is an open source implementation of portions of the proprietary NRV—Not Really Vanished—algorithm. UCL has been designed to be simple enough that a decompressor can be implemented in just a few hundred bytes of code. UCL requires no additional memory to be allocated for decompression, a considerable advantage that means that a UPX packed executable usually requires no additional memory.

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