>I encrypted my data using cipher50.fll in a small application, which worked perfectly. But it is too much effort for a large application. Has anyone used other tools like http://www.netlib.com. I was not able to find how much it costs.

I don't understand why you think its too much effort. Where's the problem?

Pricing for Netlib is here: http://www.netlib.com/genlpricing511a_forweb.pdf - sit down before you start reading...