Add Original SDK

Dinkey Pro 7.6.1/Samples/Python/Cython/README.txt

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+Cython Sample Code
+~~~~~~~~~~~~~~~~~~
+
+NB - tested under Python 2.7 and Python 3.6 with Cython 0.29 with Visual Studio C compiler
+but it should work for all versions of Python, Cython and C compiler. (We also tested the
+32-bit code using MinGW).
+
+If you are coding in Cython then you can link the Dinkey Pro/FD Runtime module directly to
+your code (rather than having to call an external Python extension). See the notes for
+Python sample code as to why this is preferable. Use:
+
+dpwin32_coff.obj    for 32-bit code
+dpwin64.obj         for 64-bit code
+
+The source files in the project are:
+
+File name       Description
+objtest.pyx     main source code file for Cython containing protection functions
+objtest.pxd     implements the DRIS structure and function definitions
+ddpro.h         Used by the pxd file so we can call DDProtCheck (a hack because it is
+                difficult to declare a stdcall function in a pxd file)
+setup.py        python file to compile the Cython sample code
+
+The sample code is just a guide. You should implement the protection in a stronger way
+using the techniques described in the "Increasing your Protection" chapter of the manual.
+
+NB - our sample code assumes that you are using 64-bit Python 3. If not then you will have
+to make some small modifications to setup.py:
+
+32-bit Python: modify extra_objects to list "dpwin32_coff.obj" instead of "dpwin64.obj"
+
+Python 2: modify 'language_level' to be "2" (If you are using an old version of Python/Cython
+          you may have to modify the objtest.pyx code. e.g. "DEMO" instead of b'DEMO' and use
+		  print instead of print()
+
+To compile run the following command:
+
+python setup.py build_ext --inplace --compiler=msvc
+
+(for mingw32 use --compiler=mingw32)
+
+So a makefile could look like this:
+
+all:
+	python setup.py build_ext -c mingw32 --inplace
+	rm -rf ./build
+	rm -f *.c
+
+Code marked with !!!! are places where you should customise the sample code so
+that it will work properly: