Note this Package is free in the asset store
Public repository for Unity3D Mobile Paint plugin
Added v1.96 sources here, so its possible to send pull request or report bugs easily (no guarantees on fixing them though, busy with other projects at the moment..). NOTE: For pull requests, please use unity version 2017.4.x or 2018.4.x (not upgrading project to 2019 anytime soon)
Feel free to post them at https://github.com/unitycoder/UnityMobilePaint/issues
Is coming up in the wiki page https://github.com/unitycoder/UnityMobilePaint/wiki
http://unitycoder.com/blog/2014/07/15/asset-store-mobile-paint/ (with downloadable android build demos)
https://forum.unity.com/threads/released-mobile-paint-with-multi-touch.262645/
MIT, as long as the code from this repository is not being sold by itself as a paint plugin.