The "xf" stands for X-Force, a famous group known for creating "keygens" (key generators). The "adsk2014 x64" refers to the 64-bit version of the Autodesk 2014 product suite, which includes industry-standard tools like AutoCAD, 3ds Max, and Maya.
The best and safest path forward is to take advantage of the many legitimate licensing options offered by Autodesk. Free trials and educational licenses provide full access for learning and short-term use, while affordable subscriptions make professional use legal and secure. This approach ensures you are using "verified" software that comes with guaranteed updates, support, and peace of mind.