Well, it all depends on how you look at it.
All you need is to provide some of your particulars and get to own a thousand dollar 2D Drafting s/w for absolutely zero cost! You have nothing to lose on that.

Yes, i agree that UGS will input your registration info into their marketing database. But i don't think they'll go to the extent of harrassing you to buy their other solutions.

The way i look at this is, simply technology sharing and spread the UGS/Solid Edge awardness further beyond geographical boundaries.

Conclusion...NO WORRIES! GO DOWNLOAD IT & HAVE FUN!