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> Don't define C-c _letter_ as a key in Lisp programs. Sequences
> consisting of C-c and a letter (either upper or lower case) are
> reserved for users; they are the only sequences reserved for users, so
> do not block them.
> Changing all the Emacs major modes to respect this convention was a
> lot of work; abandoning this convention would make that work go to
> waste, and inconvenience users. Please comply with it.

http://www.gnu.org/software/emacs/manual/html_node/elisp/Key-Binding-Conventions.html

Cheers!