VMS 4.4 source code on microfiche

Hello folks, While cleaning out a storage box I came across a padded envelope that contains 536 sheets of microfiche perporting to be the source code for VAX/VMS 4.4. Each sheet is numbered from 0001 to 0536, has a part number of AH-HP48A-SE and is marked "DIGITAL EQUIPMENT CORPORATION" / "CONFIDENTIAL AND PROPRIETARY". The envelope itself is labeled AH-HP48A-SE VAX/VMS V4.4 SRC LST MCRF (c) 1986 My question is, was DEC in the habit of selling or distributing their OS source code to third parties? If I recall correctly, VMS was written (mostly) in BLISS, but since my microfiche reader is still in storage I can't confirm the contents of these sheets. I also seem to recall a VMS simulator for MS-DOS that I have around here somewhere... Cheers, Dan