In addition Digital Signatures & the enhanced DWF (Design Web Format) format make data sharing more secure. Auto CAD LT 2013 software is built for professional drafting delivering genuine DWG compatibility reliability & powerful 2D drawing tools designed to boost your productivity. Auto CAD LT 2013 is also available in 5-User & 10 User Licence Packs: Operating Systems: Auto CAD LT works on any current standard Windows based Computer System. Apple Mac in Windows Partition or on Parallel Desktop.