Well, this seems to be a mixed bag offering. On the pros side, it is free, and presuming the software is reliable and lives up to its claims, it will allow 120 documents to be put under secure control. That’s an $89 product/service, according to their web site, or approx $1.50 per document. If you publish articles and lectures often, as I do, this seems to be a reasonable cost to limit — or track — complimentary copy distribution. Cons, well it is not free, and in order to get the most benefit, it seems to take some specific, nontrivial effort to manage the distribution process. I’ll give it a try! (If I was a lawyer, doctor, or patient trying to control access and distribution of confidential information, I’d probably have more interest too.)