USA, Canada / Shipping books / package to Poland from US [15]

Hi,

I'm planning to ship a care package to a friend in Poland from the US. Just the usual type of things, candy, baked goods, misc items and some books. I was planning to ship the package via USPS, but I was reading the USPS website and they listed some restrictions including this :

Books, periodicals, notes, printed matter, calendars, tables, drawings, cards, sketches, manuscripts, photographs, lithographs, and other reproductions of any kind made on paper or cardboard by a polygraphic process are admitted provided the number of copies of each kind does not exceed 20 and provided the addressee has obtained an import permit issued by the Minister of Foreign Trade.

I'm only planning to ship one copy of a few different books, but this seems to say that my friend would need an import permit. Has anyone shipped books to Poland? Did you have any issues?

Any advice would be greatly appreciated. Thanks!