Reading RMS opinion, he said either 10 years or a escrow for source code (so that proprietary software really do end up public domain).
14 years seems plenty enough that its really shouldn't have any real impact on copyleft. Bugs, security patches, and plain reality changes makes 14 year old software kind of unusable. Many applications that is 14 years old won't even start on modern system and hardware.
14 years seems plenty enough that its really shouldn't have any real impact on copyleft. Bugs, security patches, and plain reality changes makes 14 year old software kind of unusable. Many applications that is 14 years old won't even start on modern system and hardware.