update plan

README.md

@@ -35,15 +35,15 @@ Science:
 See [LP05, NH08, GLFN14, LHZ16] for prior work.
 
 Programming:
-- Build a collaborative digital whiteboard platform using the renderer you develop.
-- Compare rendering algorithms in practice.
+- Build a collaborative digital whiteboard platform using your own renderer.
+    - Use a modular architecture so that you can compare different renderers in practice.
 - Publish the software under an open source license, so other universities can develop it further.
 - Try to port to all platforms (Linux, Windows, Mac, Android, iOS, web)
-    - Use techniques suitable for cross platform applications. I.e., avoid platform specific SDKs like Metal, DirectX, AppKit, ...
-    - Note, it is not expected that you really port to all platforms, but it should at least be possible without major difficulties.
+    - Use techniques suitable for cross platform applications. I.e., avoid platform specific SDKs like Metal, DirectX, AppKit, CUDA, ...
+    - I don't expect that you really port to all platforms, but it should at least be possible without major difficulties.
 - Implement some nice-to-have features in the whiteboard:
     - PDF integration via [PDFium](https://pdfium.googlesource.com/pdfium/)
-        - Note, if you want to publish on iOS, this is really your only choice for a PDF library in terms of license.
+        - If you want to publish on iOS, this is really your only choice for a PDF library since GPL/AGPL is supposedly incompatible with the App Store.
     - End-to-end encryption
     - Your own ideas...