You may copy, distribute and modify the software as long as you track changes/dates in source files. Any modifications to or software including (via compiler) GPL-licensed code must also be made available under the GPL along with build & install instructions (source tldrlegal.com).
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Matrix is a robust solution if you wish to store and display 2-dimensional relational data in your ProcessWire site. The module is made up of a Fieldtype and Inputfield modules. There is no limit to the types of relational data you can represent and their application. These can range from a matrix table of clothes showing their colour, size and price variability to more complex data such as scientific measurements of air quality or transportation systems data; dates, arrivals, departures, etc. The possibilities are endless.
Full documentation on how to use Matrix can be found here and the support forum is here.
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