Interesting. nakkiel would be right if it had been in the U.S. or here in Uruguay.

From what I'm reading, that is the case in the Netherlands, the company has the right to the work:

http://www.biolegis.com/uploads/tx_articles/Who_owns_IP-olan...

"In principle the person/legal entity that has created the work (such as software), is the owner of the copyrights in that work. However, article 7 of the Copyright Act provides that if the invention is made by an employee, the employer is entitled to the copyrights."

Here's an apparent example from the Netherlands:

http://www.futureofcopyright.com/home/blog-post/2011/03/05/w...