
yEnc is a binary-to-text encoding scheme for transferring binary files in messages on Usenet or via e-mail. It reduces the overhead over previous US-ASCII-based encoding methods by using an 8-bit Extended ASCII encoding method. yEnc`s overhead is often (if each byte value appears approximately with the same frequency on average) as little as 1–....
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http://en.wikipedia.org/wiki/YEnc

Shortened form of yEncode, an alternative way of sending files over newsgroups to the traditional UUEncode system. yEnc is still relatively new, and some popular newsreaders, including
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http://www.encyclo.co.uk/local/20184
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