Hmmm, what would you do?

I'd dearly like your opinion on a certain matter and what I should do about it.
A couple of days ago I received an e-mail from a friend "I'd rather not divulge
her name" stating she saw some of my textures posted elsewhere for downloading.
I visited the site and downloaded the texture set, after opening the file much to my
anger, the set was mine with my instructions/rules taken out and she/he put a folder
of crafts that can be bought from he/she. I can't believe the gall of some people.
Below is the post on the site "Far Far Hill .....all your creative activity".

ThePost

Here's a link to the download page:
If you have the time, could you leave a comment while there.




 Here’s the rules he/she put in the zipped file, replacing mine.

condition

I left a message about you posting my work, and it seems you didn't
post it or take down my works. This leaves me to contact blogger
about your doings.  This set was created and belongs to me, and it's
not to be posted anywhere but my blog.
TAKE IT DOWN NOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Here’s more information in case you want to check the site out to see
if any of your works are posted, like mine, without any asking whatsoever.

BLOG : http://farfarhill.blogspot.com/

SHOP : http://www.nearestore.net

Now I must decide whether to stop all postings on other sites!
Curious, what would you do or if it’s happened to you.