Let's imagine consultancy A develops a code for client B that use some free available code from a website so it's a derivative work from the free code (MIT license). Can consultancy A re-use the same derivative work in for client C without copyright infringement due to client B?

  • "Freely available" doesn't necessarily mean "free to use", what license is granted with the "free code"? – Ron Beyer Oct 17 '18 at 15:24
  • MIT license, edited question – bbb Oct 17 '18 at 16:25

The consultancy can definitely work on the basis of the MIT-licensed code. However, if the contract between A and B specifies that B gets the copyrights for the developed software and A does not retain rights, then the modifications that A made for B may not be used for C. If A retains copyright, then there's no problem.

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