We know.
However, licenses for models like from Dexsoft usually require a certain encryption. No one ever talks about the strength of the encryption or that you should use a peer reviewed implementation that doesn't fall apart from the first side channel attack, but that's why they are artists in the first place
Speaking of, AES-192 and AES-256 implementations in shipping software requires you to have approval from the Unites States (the BIS to be specific) and that you annually report to two US government agencies (every January), at least if you want to export your software from the US (read: If your program comes from an US server, even if you are a citizen of the EU, you need an ERN authorization).
Further reading:
http://www.bis.doc.gov/index.php/policy-guidance/encryption/identifying-encryption-itemstl;dr: Cryptography stops being fun once you realize that the United States Government is part of the world
(hey, want to hear a fun story? When I had a layover in the US (read: I never left the airport!) two weeks ago, I had to leave fingerprints of all of my fingers, had a picture of me taken and my luggage searched. At least I got a few Department of Homeland Security stickers on some of my stuff)