legal issues of algorithm.

Ok... What can I say, exam jam is near around, I will be hugely surprised if there some dummies actually come up and write a blog. Unfortunately I am that person and I am writing in journal while doing my volunteer work. I want to wrtite something interesting about the legal issues of algorithm.
Algorithms, by themselves, are not usually patentable. In the United States, a claim consisting solely of simple manipulations of abstract concepts, numbers, or signals does not constitute "processes" (USPTO 2006), and hence algorithms are not patentable. However, practical applications of algorithms are sometimes patentable. For example, in Diamond v. Diehr, the application of a simple feedback algorithm to aid in the curing of synthetic rubber was deemed patentable. The patenting of software is highly controversial, and there are highly criticized patents involving algorithms, especially data compression algorithms, such as Unisys' LZW patent.