in the us the internet communications software is controlled under eccn 5d992 of the export administration regulations -lrb- `` ear '' -rrb- under encryption registration number -lrb- `` ern '' -rrb- r100351 and thus may not be exported or re exported from the us to or downloaded by any person in any countries controlled for anti terrorism reasons under the ear , which include iran , north korea , cuba , syria and sudan .