His claim: "Making, Using, Offering for sale, or Selling the invention throughout the United States of America or Importing the invention into the United States of America without a license is prohibited."
Note the words "the invention". His claim doesn't elaborate on what "the invention" is, but one could assume it's the product he manufactures and distributes. You can't use his (apparently) patented process to create and sell 'his product' without being a licensed dealer for 'his product'.
Buying your own plastic, poly, etc. and creating a screen cover for youself does imply 'his product' and does not violate any patents owned by him or anyone else. If you decide to mass produce them and offer them for sale, you might want to retain a patent attorney to be sure you're not in violation of any patents.
> Be careful, if you aren't careful you be hearing from William Warman's > lawyers. He has a (dubious, IMHO) patent on screen protectors for > electronic devices, and is rather litigious: > > http://www.vsps.com/screenprotector1.htm