你说
加里之所以未曾采取法律保护措施，问题并非在于缺乏司法救济渠道，而在于其作为权利人自身的取向。要说明的是，并非每个受到侵权的权利人都愿意诉诸公堂。
http://www.xys.org/forum/db/9/116/219.html我猜不是Kildall不想告，可能是他没有专利保护。而版权对软件的保护是按照literature来的。尽管Paterson不知道那个$的原因，Kildall没有证据证明Paterson抄了他的代码。而Paterson说他是在文档上看到$的。
Patents cover the underlying methodologies embodied in a given piece of software, or the function that the software is intended to serve, independent of the particular language or code that the software is written in. Copyright prevents the direct copying of some or all of a particular version of a given piece of software, but do not prevent other authors from writing their own embodiments of the underlying methodologies.
http://en.wikipedia.org/wiki/Software_patent#Overlap_with_copyright