Helvetica Neue LT Std is . It is not freeware. Linotype (now part of Monotype) holds the copyright. Downloading it from unauthorized sites is software piracy. If you use an unlicensed font in a commercial project (a logo, an advertisement, a website), you risk:

A quick search will reveal many websites offering "free" downloads of Helvetica Neue LT Std. These are often unauthorized uploads or pirated files.