To quote: An anonymous developer has released a K_License Extractor for use on retail and debug PKGs.
The k_license is a unique license string generated and embedded in PSN and other PKG files. The script will retrieve and display this k_license when ran.
Please note the app is in the form of a python script and meant for experienced devs.
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this is for extracting the "k_license" string from a pkg file in no way will this help you in obtaining a dlc package that will run on your ps3 (it can read but not write the string into the file as it appears from the description)... if you want pkg files I suggest you look here: