CVS overwrites $Revision, $Id in my data

I imported my spam-filter project into CVS also with mails it is testing on.

It modified my mails undesirably, where "$Revision" or "$Id" occurred.

Solution: cvs import -ko

I typed cvs import -ko -m "Imported all files" z/rp z start, where the option -ko turns all substitions off.

More in http://ximbiot.com/cvs/manual/cvs-1.12.13/cvs_12.html#SEC102