https://developer.apple.com/documentation/security/complying...
As of 2009, non-military cryptography exports from the U.S. are controlled by the Department of Commerce's Bureau of Industry and Security. Some restrictions still exist, even for mass market products, particularly with regard to export to "rogue states" and terrorist organizations.
Militarized encryption equipment, TEMPEST-approved electronics, custom cryptographic software, and even cryptographic consulting services still require an export license.
Furthermore, encryption registration with the BIS is required for the export of "mass market encryption commodities, software and components with encryption exceeding 64 bits" (75 FR 36494). In addition, other items require a one-time review by, or notification to, BIS prior to export to most countries. For instance, the BIS must be notified before open-source cryptographic software is made publicly available on the Internet, though no review is required. Export regulations have been relaxed from pre-1996 standards, but are still complex. Other countries, notably those participating in the Wassenaar Arrangement, have similar restrictions.
https://en.wikipedia.org/wiki/Export_of_cryptography_from_th...
Funny story about that, those used to be considered controlled munitions [0].
[0] http://www.treachery.net/~jdyson/crypto/tattoo.html