Just to add more clarity to the IPR of computer programs and if it is legal to decompile and implement a program again. In Europe, software is protected by Council Directive 91/250/EEC of 14 May 1991 on the legal protection of computer programs (http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31991L0250:EN:HT...). There are a number of things that a software vendor cannot forbid. In particular article 6 speaks about decompilation. It can be done only if the information necessary to achieve interoperability has not previously been readily available (a.1.b) to achieve programs interoperable with the first one (a.1) but not to be used for the development, production or marketing of a computer program substantially similar in its expression (a. 6.2.c). It could be argued that wine is not replicating Windows as it is just the top API. Nevertherless, to avoid any legal problems, it is better to refrain from adding any patches obtained by decompilation.
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