[Scilab-users] non access to sci files

[Carrico, Paul]

To answer to some posts (thanks for them), the goal is quite basic :
- I've a single external scilab function (.sci) that is called in scilab routine
- this file has been placed in a specific directory, but under windows, I cannot allow execution and deny reading
 
I do not really want to encrypt the file, just to deny the reading and to transform it into "black" box ... it's not a commercial issue ... I just want to protect my work from some years 
 
Paul

________________________________

De : users-bounces at lists.scilab.org [mailto:users-bounces at lists.scilab.org] De la part de Antoine Monmayrant
Envoyé : jeudi 11 avril 2013 16:45
À : International users mailing list for Scilab.
Objet : Re: [Scilab-users] non access to sci files


On 11/04/2013 16:23, Adrien Vogt-Schilb wrote:


	On 11/04/2013 11:15, Carrico, Paul wrote:
	

		Dear All,
		 
		I know it's not possible to encrypt a Scilab .sci file so far ; I want to deny reading but I want to allow execution ...
		 
		Does somebody has a trick ? 
		 
		(creating a binary file, include it in a C file, etc. ...I've don't know)
		 
		Paul

	Dear Paul, 
	
	No trick will be never possible. The user can always use fun2string to display the source code of any function that Scilab can execute after reading it from a .sci file. You cannot prevent Scilab for doing so.
	Scilab can be executed in a mode where it displays each line of code before executing it.
	The user can also modify Scilab source code to get Scilab display whatever Scilab is allow to read. If Scilab can execute it, Scilab can display it. This is completely unavoidable. 
	
	

Well, it's not completely true: what you say applies to macros, not to C (or Fortran) native functions (that is, compiled and linked).
You can translate all your code to C and write the proper wrapper to use it like a native scilab function and compile it and then remove the sources.
I think this should work but I don't know if it worths the effort.

Antoine
(and if you distribute it, are you still in agreement with scilab open licence your binary blob with no source?)


	-- 
	Adrien Vogt-Schilb (Cired)
	+33 (0) 1 43 94 73 83

	 
	
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