> please Winmerge freeware for
> business use
> need to register or buy ???
You never need to buy or register WinMerge to use it. There is no difference if you are using WinMerge in business or at home.
Strictly speaking WinMerge is not freeware. But WinMerge is Open Source . And WinMerge is using GNU Public License (GPL) .
GPL License text is always distributed with WinMerge sources and binaries.
If you are only using binaries there is nothing to worry about. Only if you want to modify WinMerge and distribute modified WinMerge binaries you must publish the changes made to the sources.
Hope this helps!
Kimmo Varis - WinMerge lead developer