Another example, suppose I hire a trucking company to move some boxes from my house to yours. Does that give the trucking company the right to open the boxes, take stuff out, put other stuff in, or just not deliver the boxes because they are "just too busy"?
"The ISP Service may not be used in a manner that interferes with Operator's efficient operation of its facilities, the provision of services or the ability of others to utilize the ISP Service in a reasonable manner. Operator may use various tools and techniques in order to efficiently manage its networks and to ensure compliance with this Acceptable Use Policy (âNetwork Management Toolsâ). These may include detecting malicious traffic patterns and preventing the distribution of viruses or other malicious code, limiting the number of peer-to-peer sessions a user can conduct at the same time, limiting the aggregate bandwidth available for certain usage protocols such as peer-to-peer and newsgroups and such other Network Management Tools as Operator may from time to time determine appropriate."
So in this case your landlord could check your mail to make sure that you aren't a terrorist. And the movers could open your boxes to ensure you weren't moving bombs[1].
The "boxes" are transparent. They don't have to open them to look inside for the bombs. There are also "sniffers" to check for explosive residue. The "trucking" company can take any road they want. But they must truck the "box" to the destination. They still do not have the right to open the box, add or subtract from the contents, or not deliver "just because they are too busy".