But it's free only because the authors made a conscious decision to make it so. They were not forced to make it available for all to use. One should not feel guilty for taking a cookie that was offered to you at church. Likewise, one should not feel guilty for using code that others have made freely available.
thor
Feel the white light, the light within
Be your own disciple, fan the sparks of will
For all of us waiting, your kingdom will come