What is the computing term for software that gives the user the chance to try it out free of charge before buying it, is subject to the usual copyright laws, and as a rule does not offer all the features of the full version at this stage?

Shareware lets a user try software free before buying, under normal copyright, usually with some features held back.

Freeware is fully free to use with no purchase, so it does not fit the try-before-buy description.

Firmware is permanent software built into a device's hardware to control it.

Malware is harmful software written to damage or intrude, the opposite of a legitimate trial product.

A shareware trial often expires or nags for payment until the user buys the full version.

Buying shareware typically unlocks the complete set of features.