How to keep people from reading

[l0st]

No, the official version 6.0 TIFF uses 6 different types of compression (besides "none"):
CCITT Group 3
CCITT T.4
CCITT T.6
LZW
JPEG
PackBits (a kind of RLE compression)

Yikes. I bet you're right but back in the day when I converted a company to digital fax I believe the original codec was RLE now that you mention it. I think jpeg2000 was the "fast fax" codec (14.4Kbps+). It's been a LONG time and I haven't faxed a damn thing decades... I guess back to the future II got that wrong lol. We stopped using fax a year or two after that over HIPAA concerns.