Copyright issues will depend on exactly what software/firmware you end up using but there shouldn’t be a problem.
In terms of other legal issues, you have all of the normal regulatory requirements that apply for any electronics that you wish to sell as an end product.
Since the DWM1001 is sold as a module for inclusion in a product and the DWM1001-DEV is a development kit not an end product they are exempt from this requirement but if you make a product that uses them you won’t be.
As noted here: DWM1001 Now FCC, IC and CE Certified! the DWM1001 has approval as a pre-certified radio module for certain countries, that means that within those countries you only have to do the standard testing and certification required for non-radio products, something that massively simplifies things. Outside of those countries getting approval will involve a lot more paperwork.