The BSD license requires users to reveal that they're using the code released under such license, whenever they're shipping a product, be it a software package or a car. It allows some sneaky tracking of companies that use your open source projects.

Here are some companies I found using my ASN.1 compiler:

Aastra OpenCom 100	ftp://aux.detewe.ru/OC100_FW/Rel%2010.0/Installation_CD/OpenCom100/Manual/OSS_Licenses.pdf
Apple	http://lionet.livejournal.com/43412.html
Cisco	http://www.cisco.com/c/en/us/td/docs/security/asa/asa82/license/opensrce.html#wp49473
Mercedes-Benz	http://moba.i.daimler.com/bai-cars/ba/foss/content/en/assets/FOSS_licences.pdf, p. 107
Mitel (Polycom)	http://www.mitel.com/sites/default/files/EULA-Mitel-100.pdf, p. 9
NASA	http://www.aviationsystemsdivision.arc.nasa.gov/publications/2015/NASA-TM-2015-218427.pdf, p. 4
Rovio (Angry Birds)	http://www.rovio.com/oss/license/asn1
Juniper	https://www.juniper.net/techpubs/en_US/sbr-carrier8.1.0/information-products/topic-collections/sbr-admin-guide-10/book-sw-sbrc-admin.pdf, p. iii
QNX	http://support7.qnx.com/download/download/27075/TPLTL.v2.22.Apr9-15.pdf, p. 180
Samsung	http://www.samsung.com/us/support/owners/product/WAM750/ZA, p. 81