@cinebox the code in your project may be opensource, you may also have given the psd files too. But to change the content of those PSD files (depending on what the contributor wants to change) the contributor needs to purchase photoshop and use proprietary software. In a way you are placing a restriction for people who don't want to buy photoshop. it means to contribute to your project one has to purchase proprietary software.
@raghukamath even if photoshop is the only tool that serves the role I need?
@cinebox even if it is the only software that serves your need, it won't change the fact that to contribute to your project one needs a photoshop license.
@cinebox to clarify, I am not saying you personaly should not use photoshop, what I am saying is you shouldn't make it so that to contribute one needs to use photoshop. May be you can use open formats to keep the source files.
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