Nul character added to pdf download
The CPLEX Callable Library, written in the programming language C, requires a NUL character to terminate a string. This convention, known in C and related The null character is a control character with the value zero. It is present in many character sets, RFC 20. NUL (Null): The all-zeros character which may serve to accomplish time fill and media fill. ^ "The set of control characters of the ISO 646" (PDF).