Seems like you can distribute it. But you can't create a competing product based on it. See point b here, that should let you send patches.
> 2. The provisions of paragraph 1 shall not permit the information obtained through its application:
> (a) to be used for goals other than to achieve the interoperability of the independently created computer program;
> (b) to be given to others, except when necessary for the interoperability of the independently created computer program;
> (c) to be used for the development, production or marketing of a computer program substantially similar in its expression, or for any other act which infringes copyright.
Edit: The point of the ruling was that this clause can be interpreted to work for fixing bugs and not just interoperate with other programs. So everything here goes for fixing bugs as well.
> 2. The provisions of paragraph 1 shall not permit the information obtained through its application:
> (a) to be used for goals other than to achieve the interoperability of the independently created computer program;
> (b) to be given to others, except when necessary for the interoperability of the independently created computer program;
> (c) to be used for the development, production or marketing of a computer program substantially similar in its expression, or for any other act which infringes copyright.
Edit: The point of the ruling was that this clause can be interpreted to work for fixing bugs and not just interoperate with other programs. So everything here goes for fixing bugs as well.