...
This directive can be used only with network licenses; accordingly, the COUNT directive must be set if BORROW is set.
Usage and recommendations
The license borrowing feature lets users run your software on a computer that is not continuously connected to the network, such as a laptop, by allowing a floating network license to be leased for a time-limited period.
Borrowing works by making a floating network license available for a certain amount of time to the requesting computer, and making it unavailable on the license server for this time. Through a borrow request, the client can obtain the time-limited license, which will work like a local uncounted license.
...
Borrowing is enabled by default. You may wish to disable borrowing to increase checkout speed (see Optimizing license checkout speed) or to increase security. Although fairly secure, borrowing is by nature less secure than other mechanisms in LM-X. You should recognize that there is a trade-off between the convenience offered by implementing borrowing and the overall strength of your licensing solution.
...