Copyrights protect original works of authorship fixed in any tangible medium of expression. Copyright protection also extends to derivative works. If a new work

Copyrights protect original works of authorship fixed in any tangible medium of expression. Copyright protection also extends to derivative works. If a new work is transformative when compared to a parent work, the child work is not considered derivative. In that case copyright doesn't extend to the child work. In the opposite case the opposite would be true. So the issue is whether an algorithm implementation is transformative when compared to the pseudocode. The answer to your main question is fact specific. Each case is different and a court of law will look at the specific facts and make a ruling. Talk to a lawyer for counsel that relates to your specific facts.