Who uses the RSA BSAFE library?
A lot of companies use BSAFE: for a long time, BSAFE was the most successful supported cryptographic toolkits: it predates the success of open source software, it predates the availability of crypto APIs in operating systems, and it predates the expiration of patents on RSA and public-key cryptography in general. And it's always been a reliable, well-tested, well-documented, portable library from a company that ported it everywhere there was a customer and provided support. So, it garnered a lot of customers. The number of developers using BSAFE has presumably declined as the patents expired, export restrictions relaxed, allowing OS crypto APIs, and open source ate the market, but I'm sure there's still a very large number of products that incorporate BSAFE.