[law]

It's a fine line to walk. On the one hand, community-vetted code is a spectacular idea for the core algorithms, but on the other, overly-restrictive licenses (like [L]GPL) effectively preclude the maximum utility being derived from them.

[dubya]

OTOH, if you do need to write your own code, you could use the existing test suites to make it a lot easier. I think the GPL would allow this.