We share several of our UHF bands with unlicensed services, and from time to time, you’ll encounter those signals on the bands. Another reason to be familiar with them is that there are companies that have their eyes on them.
A recent article on this topic, “Understanding regulations when designing a wireless product in the unlicensed frequency bands,” notes:
The wireless unlicensed frequency bands—especially the industrial, scientific, medical (ISM) bands—are the most appropriate for many new applications and products. They are part of the frequency spectrum that can be used without a license. However, products developed in these bands still are required to be compliant with rules defined by the country’s regulatory bodies before being deployed in the field. This article focuses on the technical design requirements and mandates for the US region.
Could be interesting reading.