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Trailing-Edge - PDP-10 Archives - BB-M080M-SM - tcpip-sources/readme.mem
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The files in this save-set have  been  encrypted.   You  can
obtain  'plain-text'  source  files by using the DCRYPT tool
included in this save-set and the KEY files from  the  TCPIP
Source  Distribution  tape  (BB-EV84A-BM).  There is one key
file for each source file.

As an example:

@RUN DCRYPT
[DCRYPT version 1(3)]
DCRYPT>DEC XYZ.ENC XYZ.KEY XYZ.MAC