If that is true you could reimplement Photoshop 1.0 with the clean room method [1] and have a perfectly legal clone, which you would then be free to expand. [1

If that is true you could reimplement Photoshop 1.0 with the clean room method [1] and have a perfectly legal clone, which you would then be free to expand. [1] https://en.wikipedia.org/wiki/Clean_room_design https://en.wikipedia.org/wiki/Clean_room_design