Since i cant wait unitl my last puzzle is over, here is yet another one.
As i had to deal with them during my studies and have to deal with them later on a daily basis during work the encryption-method was easily found.
You know this code already, you see it every day, its on every product you buy in a store: at least the legal ones^^
The mighty barcode!

Of course more data requieres more complex codes etc., this is why there are several "code-families" to choose from, each with its own pros and cons. The code you probably encountered most is the so called EAN-13 to encode the GTIN of your product. At first i planned to use this one, but thought it might be too hard to decode manually.
So i thought of using Code 128 since its very popular too, but got stuck at the problem of the visualization of three different bar-weights.. So i went back one step and used a more basic code, which for instance dont uses a validationcharacter/checksum (but is still kinda self-checking).

To get the correct code-family you have to learn a little bit more about the construction of the used barcode:

1. there are two different weights (bold/thin)
2. every character consists of 9 elements.
   • a element is considered as bar or blank
3. for every character exactly 3 of 9 elements are bold

(Should be fairly easy to google with the given hints ;))

For better readability i stretched the code, seperated the characters, and dropped the start/stop characters. (needed for scanners)
And since the code used here in particular can't differ the cases i have to tell you straight ahead that only the second character is upper-case.

III II - III II - III II - I IIII - I IIII

phew...got a little bit carried away with the education part...but maybe someone found this actually quite infomative (and read the wiki) xD

SOLUTION

long story short: you were looking for Code39. With the tables distributet on wikipedia you could easily match the bars with the corrosponding character. Same at second stage, or just upload the picture to one of the many web-tools wich can read barcode from images. :)

View attached image.