Yes, that's right, if you wear someone else's arms without permission,
be prepared to pay the price, in terms of PK cause given to the person
or organisation whose arms you have worn.

This has been added to HELP PKCAUSE, in a new section, 18.

18) BEARING ARMS
If you wear anything emblazoned with arms, and you are not doing so
with permission, then the armiger (the owner/registrant) of the arms
gains cause against you, one kill. The armiger obviously can wear his
own registered arms at any time, and have them emblazoned as he sees
fit. If the armiger is an organisation, this organisation gains cause
for exactly one kill total, not one kill per member.

If there is any doubt as to whether permission has been granted or
not, this will severely limit the likelihood of granting PK cause,
so be very careful to be exceedingly clear about such things, if you
do for some reason grant permission to someone else to bear your arms.

Penned by my hand on the 2nd of Daedalan, in the year 367 AF.