There are several categories of the packages that are sent through the courier packages services of the UPS some of them are having a simple form and only requires the normal delivery. While some others are required to be signed by the recipient of the packages, and there are some factors behind such compulsory signing requirement.
The number one or the very first factor is the requirement of signs by the shipper. In some special cases or generally in all business transactions the shipper requires the delivery to be completed by the signs of the recipient of the package which is the other customer.
Other factors may be when the package contains some very high valued items, which are subject to some kind of threat in any forms those packages also require the delivery to be completed by the compulsory sign from the recipient of the package.